feat(ui): expand workflow-ready components

.changeset/fair-rules-boil.md

@@ -0,0 +1,5 @@
+---
+"@ai-ui/ui": minor
+---
+
+Expand empty states, table display controls, row detail sheets, and richer command, combobox, popover, and dropdown menu compositions for real product workflows.

apps/docs/src/components/combobox.stories.tsx

@@ -62,6 +62,83 @@ function ControlledDemo() {
   );
 }
 
+function RecentAndSuggestedDemo() {
+  const [value, setValue] = useState("");
+
+  const items = [
+    {
+      value: "recent-legal",
+      label: "Legal review",
+      group: "Recent",
+      description: "Last used in yesterday’s policy update."
+    },
+    {
+      value: "recent-design",
+      label: "Design review",
+      group: "Recent",
+      description: "Common pick for UI launches."
+    },
+    ...teamItems
+  ];
+
+  return (
+    <div className="grid w-[420px] gap-4">
+      <Combobox
+        aria-label="Suggested routing team"
+        emptyMessage={(query) => `No team named “${query}”. Create a custom routing lane instead.`}
+        footer={
+          <div className="flex items-center justify-between gap-3">
+            <p className="text-xs text-[var(--color-muted-foreground)]">
+              Need a specialist lane?
+            </p>
+            <Button size="sm" variant="ghost">
+              Create lane
+            </Button>
+          </div>
+        }
+        items={items}
+        onValueChange={setValue}
+        searchPlaceholder="Search recent and suggested teams"
+        value={value}
+      />
+      <div className="rounded-[var(--radius-md)] border border-[var(--color-border)] bg-[var(--color-card)] px-4 py-3 text-sm text-[var(--color-muted-foreground)] shadow-[var(--shadow-xs)]">
+        Current routing lane:{" "}
+        <span className="font-medium text-[var(--color-foreground)]">
+          {value || "No lane selected"}
+        </span>
+      </div>
+    </div>
+  );
+}
+
+function AsyncResultsDemo() {
+  const [searchValue, setSearchValue] = useState("");
+  const trimmedSearch = searchValue.trim().toLowerCase();
+
+  const isSearching = trimmedSearch.length > 0 && trimmedSearch.length < 3;
+
+  return (
+    <div className="grid w-[420px] gap-4">
+      <Combobox
+        aria-label="Async routing search"
+        emptyMessage={(query) =>
+          `No routing lane matched “${query}”. Try a broader keyword or create a new lane.`
+        }
+        items={[...teamItems]}
+        loading={isSearching}
+        loadingMessage="Searching routing lanes…"
+        onSearchValueChange={setSearchValue}
+        searchPlaceholder="Type at least 3 characters"
+        searchValue={searchValue}
+      />
+      <p className="m-0 text-sm leading-6 text-[var(--color-muted-foreground)]">
+        This pattern is useful when the results come from an API and you need a clear
+        transition between loading, empty, and selectable states.
+      </p>
+    </div>
+  );
+}
+
 function LaunchRoutingForm() {
   const [submitted, setSubmitted] = useState<Record<string, string> | null>(null);
   const form = useForm<{ team: string }>({
@@ -158,6 +235,14 @@ export const Controlled: Story = {
   render: () => <ControlledDemo />
 };
 
+export const RecentAndSuggested: Story = {
+  render: () => <RecentAndSuggestedDemo />
+};
+
+export const AsyncResults: Story = {
+  render: () => <AsyncResultsDemo />
+};
+
 export const WithForm: Story = {
   render: () => <LaunchRoutingForm />
 };

apps/docs/src/components/command.stories.tsx

@@ -55,13 +55,74 @@ function InlineCommandShowcase() {
   );
 }
 
+function OperationsWorkbenchShowcase() {
+  return (
+    <Command
+      className="w-[560px]"
+      footer={
+        <div className="flex items-center justify-between gap-3">
+          <p className="m-0 text-xs text-[var(--color-muted-foreground)]">
+            Tip: press <kbd className="rounded border px-1.5 py-0.5">Enter</kbd> to run the highlighted action.
+          </p>
+          <Button size="sm" variant="ghost">
+            Manage actions
+          </Button>
+        </div>
+      }
+      label="Operations workbench"
+      loop
+    >
+      <CommandInput placeholder="Search releases, docs, and recent work" />
+      <CommandList>
+        <CommandEmpty>No matching actions.</CommandEmpty>
+        <CommandGroup heading="Recent">
+          <CommandItem keywords={["launch", "release"]} value="recent-launch-review">
+            Launch review
+            <CommandShortcut>R</CommandShortcut>
+          </CommandItem>
+          <CommandItem keywords={["blocked", "queue"]} value="recent-blocked-queue">
+            Blocked queue
+            <CommandShortcut>B</CommandShortcut>
+          </CommandItem>
+        </CommandGroup>
+        <CommandSeparator />
+        <CommandGroup heading="Suggestions">
+          <CommandItem keywords={["docs", "stories"]} value="docs-storybook">
+            Open Storybook docs
+            <CommandShortcut>G D</CommandShortcut>
+          </CommandItem>
+          <CommandItem disabled value="compliance-review">
+            Compliance review locked
+            <CommandShortcut>Locked</CommandShortcut>
+          </CommandItem>
+        </CommandGroup>
+      </CommandList>
+    </Command>
+  );
+}
+
 function DialogCommandShowcase() {
   const [open, setOpen] = useState(false);
 
   return (
     <div className="flex justify-center">
       <Button onClick={() => setOpen(true)}>Open command palette</Button>
-      <CommandDialog onOpenChange={setOpen} open={open}>
+      <CommandDialog
+        description="Jump to docs, recent launches, and operational shortcuts without leaving the current view."
+        footer={
+          <div className="flex items-center justify-between gap-3">
+            <p className="m-0 text-xs text-[var(--color-muted-foreground)]">
+              Need a new action? Add it to the workspace command registry.
+            </p>
+            <Button size="sm" variant="ghost">
+              Manage shortcuts
+            </Button>
+          </div>
+        }
+        onOpenChange={setOpen}
+        open={open}
+        title="Workspace command palette"
+      >
         <CommandInput placeholder="Type a command or search" />
         <CommandList>
           <CommandEmpty>No commands available.</CommandEmpty>
@@ -87,6 +148,22 @@ function DialogCommandShowcase() {
   );
 }
 
+function LoadingResultsShowcase() {
+  return (
+    <Command
+      className="w-[520px]"
+      label="Remote workspace search"
+      loading
+      loadingMessage="Searching remote workspace actions…"
+    >
+      <CommandInput placeholder="Search actions from all workspaces" />
+      <CommandList>
+        <CommandEmpty>No commands available.</CommandEmpty>
+      </CommandList>
+    </Command>
+  );
+}
+
 const meta = {
   title: "Components/Command",
   component: InlineCommandShowcase,
@@ -104,6 +181,14 @@ export const Playground: Story = {
   render: () => <InlineCommandShowcase />
 };
 
+export const OperationsWorkbench: Story = {
+  render: () => <OperationsWorkbenchShowcase />
+};
+
 export const DialogPalette: Story = {
   render: () => <DialogCommandShowcase />
 };
+
+export const LoadingResults: Story = {
+  render: () => <LoadingResultsShowcase />
+};

apps/docs/src/components/data-table.stories.tsx

@@ -128,6 +128,7 @@ const routingColumns: DataTableColumn<RoutingLaneRow>[] = [
       </div>
     ),
     header: "Lane",
+    hideable: false,
     id: "lane",
     sortable: true,
     width: "18rem"
@@ -141,6 +142,7 @@ const routingColumns: DataTableColumn<RoutingLaneRow>[] = [
       </div>
     ),
     header: "Owner",
+    hideable: true,
     id: "owner",
     sortable: true,
     width: "15rem"
@@ -166,6 +168,7 @@ const routingColumns: DataTableColumn<RoutingLaneRow>[] = [
       </div>
     ),
     header: "Signal",
+    hideable: true,
     id: "state",
     sortable: true,
     width: "12rem"
@@ -178,6 +181,7 @@ const routingColumns: DataTableColumn<RoutingLaneRow>[] = [
       </p>
     ),
     header: "Routing note",
+    hideable: true,
     id: "note",
     width: "34rem"
   }
@@ -237,6 +241,46 @@ function RoutingEmptyState({ onReset }: { onReset: () => void }) {
   );
 }
 
+function RoutingLaneDetail({ row }: { row: RoutingLaneRow }) {
+  return (
+    <div className="grid gap-4">
+      <div className="grid gap-3 rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-4 shadow-[var(--shadow-xs)]">
+        <div className="flex flex-wrap items-center gap-2">
+          <Badge size="sm" tone={getStateTone(row.state)} variant="outline">
+            {row.state}
+          </Badge>
+          <Badge size="sm" variant="outline">
+            {row.lane}
+          </Badge>
+          <Badge size="sm" variant="outline">
+            {row.audience}
+          </Badge>
+        </div>
+        <p className="text-sm leading-6 text-[var(--color-foreground)]">{row.note}</p>
+      </div>
+
+      <div className="grid gap-3 sm:grid-cols-2">
+        <div className="rounded-[var(--radius-md)] border border-[var(--color-border)] bg-[var(--color-background)] p-4">
+          <p className="text-xs uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]">
+            Owner
+          </p>
+          <p className="mt-2 text-sm font-medium text-[var(--color-foreground)]">{row.owner}</p>
+          <p className="mt-1 text-sm text-[var(--color-muted-foreground)]">{row.ownerEmail}</p>
+        </div>
+        <div className="rounded-[var(--radius-md)] border border-[var(--color-border)] bg-[var(--color-background)] p-4">
+          <p className="text-xs uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]">
+            Next gate
+          </p>
+          <p className="mt-2 text-sm font-medium text-[var(--color-foreground)]">{row.nextGate}</p>
+          <p className="mt-1 text-sm text-[var(--color-muted-foreground)]">
+            Signal score {row.signalScore}
+          </p>
+        </div>
+      </div>
+    </div>
+  );
+}
+
 function DataTablePlayground() {
   const [filter, setFilter] = useState<RoutingFilter>("all");
   const [searchValue, setSearchValue] = useState("");
@@ -288,6 +332,7 @@ function DataTablePlayground() {
       <div className="w-full max-w-[1120px] rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-4 shadow-[var(--shadow-sm)]">
         <DataTable
           columns={routingColumns}
+          defaultDensity="comfortable"
           empty={<RoutingEmptyState onReset={resetView} />}
           enableSelection
           getRowId={(row) => row.id}
@@ -296,6 +341,7 @@ function DataTablePlayground() {
           onSortingChange={setSorting}
           pageSize={3}
           pageSizeOptions={[3, 5]}
+          renderRowDetails={(row) => <RoutingLaneDetail row={row} />}
           renderRowActions={(row) => (
             <Button
               size="sm"
@@ -308,6 +354,10 @@ function DataTablePlayground() {
             </Button>
           )}
           rows={visibleRows}
+          rowDetailsDescription={(row) =>
+            `${row.lane} routing handoff for ${row.audience.toLowerCase()}`
+          }
+          rowDetailsTitle={(row) => `${row.lane} lane detail`}
           searchLabel="Search routing lanes"
           searchPlaceholder="Search lanes, owners, and notes"
           searchValue={searchValue}

apps/docs/src/components/dropdown-menu.stories.tsx

@@ -16,6 +16,34 @@ import {
 } from "@ai-ui/ui";
 import type { Meta, StoryObj } from "@storybook/react";
 
+function StatusIcon() {
+  return (
+    <svg aria-hidden="true" className="size-4" fill="none" viewBox="0 0 16 16">
+      <path
+        d="M3 8.5 6.25 11.75 13 5"
+        stroke="currentColor"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+        strokeWidth="1.5"
+      />
+    </svg>
+  );
+}
+
+function LayersIcon() {
+  return (
+    <svg aria-hidden="true" className="size-4" fill="none" viewBox="0 0 16 16">
+      <path
+        d="m8 2 6 3.5L8 9 2 5.5 8 2Zm0 5 6 3.5L8 14l-6-3.5L8 7Z"
+        stroke="currentColor"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+        strokeWidth="1.3"
+      />
+    </svg>
+  );
+}
+
 async function waitForCondition(
   predicate: () => boolean,
   message: string,
@@ -46,31 +74,72 @@ function ReleaseMenu({ triggerLabel = "Open menu" }: ReleaseMenuProps) {
       </DropdownMenuTrigger>
       <DropdownMenuContent>
         <DropdownMenuLabel>Launch actions</DropdownMenuLabel>
-        <DropdownMenuItem>
+        <DropdownMenuItem
+          description="Open the latest rollout summary and reviewer comments."
+          leading={<StatusIcon />}
+          shortcut="R"
+        >
           Review summary
-          <DropdownMenuShortcut>R</DropdownMenuShortcut>
         </DropdownMenuItem>
-        <DropdownMenuItem>
+        <DropdownMenuItem
+          description="Copy the current branch preview and release notes."
+          leading={<LayersIcon />}
+          shortcut="S"
+        >
           Share preview
-          <DropdownMenuShortcut>S</DropdownMenuShortcut>
         </DropdownMenuItem>
-        <DropdownMenuItem disabled>
+        <DropdownMenuItem
+          description="Disabled while the current verification step is still running."
+          disabled
+          shortcut="⌘R"
+        >
           Retry checks
-          <DropdownMenuShortcut>⌘R</DropdownMenuShortcut>
         </DropdownMenuItem>
         <DropdownMenuSeparator />
-        <DropdownMenuCheckboxItem checked>Notify stakeholders</DropdownMenuCheckboxItem>
+        <DropdownMenuCheckboxItem
+          checked
+          description="Post a summary to launch-updates after approval."
+          shortcut="N"
+        >
+          Notify stakeholders
+        </DropdownMenuCheckboxItem>
         <DropdownMenuSeparator />
         <DropdownMenuRadioGroup value="staged">
-          <DropdownMenuRadioItem value="staged">Staged rollout</DropdownMenuRadioItem>
+          <DropdownMenuRadioItem
-          <DropdownMenuRadioItem value="global">Global rollout</DropdownMenuRadioItem>
+            description="Ship to 10% of traffic first."
+            shortcut="1"
+            value="staged"
+          >
+            Staged rollout
+          </DropdownMenuRadioItem>
+          <DropdownMenuRadioItem
+            description="Ship globally as soon as the release is approved."
+            shortcut="2"
+            value="global"
+          >
+            Global rollout
+          </DropdownMenuRadioItem>
         </DropdownMenuRadioGroup>
         <DropdownMenuSeparator />
         <DropdownMenuSub>
-          <DropdownMenuSubTrigger inset>More actions</DropdownMenuSubTrigger>
+          <DropdownMenuSubTrigger
-          <DropdownMenuSubContent>
+            description="Secondary actions that should stay grouped away from the primary flow."
-            <DropdownMenuItem>Duplicate release</DropdownMenuItem>
+            inset
-            <DropdownMenuItem variant="destructive">Archive release</DropdownMenuItem>
+          >
+            More actions
+          </DropdownMenuSubTrigger>
+          <DropdownMenuSubContent size="lg">
+            <DropdownMenuItem
+              description="Create a sibling release with the same routing and metadata."
+            >
+              Duplicate release
+            </DropdownMenuItem>
+            <DropdownMenuItem
+              description="Move the release out of the active workspace without deleting it."
+              variant="destructive"
+            >
+              Archive release
+            </DropdownMenuItem>
           </DropdownMenuSubContent>
         </DropdownMenuSub>
       </DropdownMenuContent>
@@ -137,7 +206,7 @@ export const States: Story = {
     docs: {
       description: {
         story:
-          "Open the menu to inspect the checked checkbox item, the selected radio item, a disabled action, the inset submenu trigger, and the destructive nested action."
+          "Open the menu to inspect richer action rows with descriptions, leading icons, inline shortcuts, checked and selected states, a disabled row, an inset submenu trigger, and a destructive nested action."
       }
     }
   },
@@ -149,6 +218,74 @@ export const States: Story = {
   )
 };
 
+export const ContextPanels: Story = {
+  parameters: {
+    docs: {
+      description: {
+        story:
+          "These examples show common product-style menu compositions: a release action menu and a denser context menu for row-level operations."
+      }
+    }
+  },
+  render: () => (
+    <div className="grid w-[920px] gap-4 lg:grid-cols-[minmax(0,0.95fr)_minmax(0,1.05fr)]">
+      <div className="rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 shadow-[var(--shadow-sm)]">
+        <h3 className="text-lg font-semibold tracking-[var(--tracking-tight)] text-[var(--color-foreground)]">
+          Release actions
+        </h3>
+        <p className="mt-2 text-sm leading-6 text-[var(--color-muted-foreground)]">
+          Use richer labels when the command needs more context than a single verb.
+        </p>
+        <div className="mt-6">
+          <ReleaseMenu triggerLabel="Open release actions" />
+        </div>
+      </div>
+
+      <div className="rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 shadow-[var(--shadow-sm)]">
+        <h3 className="text-lg font-semibold tracking-[var(--tracking-tight)] text-[var(--color-foreground)]">
+          Row context menu
+        </h3>
+        <p className="mt-2 text-sm leading-6 text-[var(--color-muted-foreground)]">
+          Denser menus can still remain readable when every item communicates hierarchy,
+          risk, and keyboard hints clearly.
+        </p>
+        <div className="mt-6">
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button variant="secondary">Open row menu</Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent size="xl">
+              <DropdownMenuLabel inset>Task 17A · routing</DropdownMenuLabel>
+              <DropdownMenuItem
+                description="Move the task into the launch lane without changing ownership."
+                leading={<StatusIcon />}
+                shortcut="M"
+              >
+                Move to launch lane
+              </DropdownMenuItem>
+              <DropdownMenuItem
+                description="Open the full thread timeline for the assigned reviewer."
+                leading={<LayersIcon />}
+                shortcut="T"
+              >
+                Open thread timeline
+              </DropdownMenuItem>
+              <DropdownMenuSeparator />
+              <DropdownMenuItem
+                description="Escalate this task into the blocked queue and notify the operator."
+                variant="destructive"
+                shortcut="E"
+              >
+                Escalate blocker
+              </DropdownMenuItem>
+            </DropdownMenuContent>
+          </DropdownMenu>
+        </div>
+      </div>
+    </div>
+  )
+};
+
 export const Anatomy: Story = {
   render: () => (
     <div className="w-[720px] rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 text-[var(--color-foreground)] shadow-[var(--shadow-sm)]">
@@ -172,7 +309,10 @@ export const Anatomy: Story = {
             <code className="text-[var(--color-foreground)]">data-slot="label"</code>,{" "}
             <code className="text-[var(--color-foreground)]">data-slot="separator"</code>, and{" "}
             <code className="text-[var(--color-foreground)]">data-slot="icon"</code> support
-            grouping, dividers, and selection markers.
+            grouping, dividers, and selection markers, while{" "}
+            <code className="text-[var(--color-foreground)]">data-slot="description"</code> and{" "}
+            <code className="text-[var(--color-foreground)]">data-slot="leading"</code> support
+            denser contextual rows.
           </p>
         </div>
       </div>

apps/docs/src/components/empty-state.stories.tsx

@@ -26,27 +26,40 @@ function EmptyStateGlyph() {
 }
 
 function ReleaseEmptyState({
+  actionsLayout = "inline",
+  align = "center",
   description = "Adjust the current filters or create a new release to start routing work.",
   eyebrow = "No results",
+  layout = "default",
+  mediaSize = "default",
   tone = "default",
   title = "No matching releases"
 }: {
+  actionsLayout?: "inline" | "stack";
+  align?: "center" | "start";
   description?: string;
   eyebrow?: string;
+  layout?: "compact" | "default" | "split";
+  mediaSize?: "compact" | "default" | "hero";
   title?: string;
   tone?: "default" | "subtle" | "accent";
 }) {
   return (
-    <EmptyState className="w-[min(100%,42rem)]" tone={tone}>
+    <EmptyState
-      <EmptyStateMedia>
+      align={align}
+      className="w-[min(100%,42rem)]"
+      layout={layout}
+      tone={tone}
+    >
+      <EmptyStateMedia size={mediaSize}>
         <EmptyStateGlyph />
       </EmptyStateMedia>
-      <EmptyStateHeader>
+      <EmptyStateHeader align={align}>
         <EmptyStateEyebrow>{eyebrow}</EmptyStateEyebrow>
         <EmptyStateTitle>{title}</EmptyStateTitle>
         <EmptyStateDescription>{description}</EmptyStateDescription>
       </EmptyStateHeader>
-      <EmptyStateActions>
+      <EmptyStateActions layout={actionsLayout}>
         <Button>Create release</Button>
         <Button variant="ghost">Reset filters</Button>
       </EmptyStateActions>
@@ -89,6 +102,55 @@ export const Scenarios: Story = {
   )
 };
 
+export const CompactQueue: Story = {
+  parameters: {
+    docs: {
+      description: {
+        story:
+          "Use the compact layout when an empty state lives inside a dense operational card, list, or queue panel and should preserve surrounding information density."
+      }
+    }
+  },
+  render: () => (
+    <div className="w-[720px] rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 shadow-[var(--shadow-sm)]">
+      <ReleaseEmptyState
+        actionsLayout="stack"
+        align="start"
+        description="The global queue is clear. Create a task template now or wait for the next dispatch cycle."
+        eyebrow="Queue clear"
+        layout="compact"
+        mediaSize="compact"
+        title="No blocked work right now"
+        tone="subtle"
+      />
+    </div>
+  )
+};
+
+export const SplitWorkspace: Story = {
+  parameters: {
+    docs: {
+      description: {
+        story:
+          "Use the split layout when the empty state needs more narrative weight, richer actions, or a larger visual anchor inside a dashboard or setup surface."
+      }
+    }
+  },
+  render: () => (
+    <div className="w-[940px] rounded-[var(--radius-xl)] border border-[var(--color-border)] bg-[var(--color-background)] p-6">
+      <ReleaseEmptyState
+        align="start"
+        description="Invite operators, connect the first runtime, and define the initial routing lane to turn this empty workspace into an active control surface."
+        eyebrow="Workspace setup"
+        layout="split"
+        mediaSize="hero"
+        title="This command center needs its first operator"
+        tone="accent"
+      />
+    </div>
+  )
+};
+
 export const Anatomy: Story = {
   render: () => (
     <div className="w-[760px] rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 text-[var(--color-foreground)] shadow-[var(--shadow-sm)]">
@@ -117,6 +179,13 @@ export const Anatomy: Story = {
             <code className="text-[var(--color-foreground)]">data-tone</code> exposes whether the
             surface stays neutral, subtle, or accent-led.
           </p>
+          <p>
+            <code className="text-[var(--color-foreground)]">layout</code>,{" "}
+            <code className="text-[var(--color-foreground)]">align</code>,{" "}
+            <code className="text-[var(--color-foreground)]">size</code>, and{" "}
+            <code className="text-[var(--color-foreground)]">actions layout</code> let the same
+            composition flex between dense cards and broader setup moments.
+          </p>
         </div>
       </div>
     </div>

apps/docs/src/components/popover.stories.tsx

@@ -1,5 +1,6 @@
 import {
   Button,
+  Input,
   Popover,
   PopoverArrow,
   PopoverClose,
@@ -61,6 +62,111 @@ function SummaryPopover({
   );
 }
 
+function InspectorPopover() {
+  return (
+    <Popover>
+      <PopoverTrigger asChild>
+        <Button>Open release inspector</Button>
+      </PopoverTrigger>
+      <PopoverContent padding="none" size="xl" side="right" className="overflow-hidden">
+        <div className="border-b border-[var(--color-border)] px-5 py-4">
+          <p className="text-xs uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]">
+            Release inspector
+          </p>
+          <h3 className="mt-2 text-lg font-semibold text-[var(--color-foreground)]">
+            Rollout checklist
+          </h3>
+          <p className="mt-1 text-sm leading-6 text-[var(--color-muted-foreground)]">
+            Keep the surface anchored to the trigger while still supporting denser,
+            panel-like review content.
+          </p>
+        </div>
+        <div className="grid gap-4 px-5 py-4">
+          <div className="grid gap-1">
+            <span className="text-sm font-medium text-[var(--color-foreground)]">
+              Rollout owner
+            </span>
+            <Input defaultValue="ops@cadence.dev" readOnly />
+          </div>
+          <div className="grid gap-3 sm:grid-cols-2">
+            {[
+              ["Checks", "12 passed"],
+              ["Approvals", "2 waiting"],
+              ["Scope", "10% traffic"],
+              ["Alerts", "Muted"]
+            ].map(([label, value]) => (
+              <div
+                key={label}
+                className="rounded-[var(--radius-md)] border border-[var(--color-border)] bg-[var(--color-surface)] px-4 py-3"
+              >
+                <p className="text-xs uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]">
+                  {label}
+                </p>
+                <p className="mt-2 text-sm font-medium text-[var(--color-foreground)]">
+                  {value}
+                </p>
+              </div>
+            ))}
+          </div>
+        </div>
+        <div className="flex justify-between gap-3 border-t border-[var(--color-border)] bg-[color-mix(in_oklch,var(--color-surface)_72%,white_28%)] px-5 py-4">
+          <PopoverClose asChild>
+            <Button size="sm" variant="ghost">
+              Close
+            </Button>
+          </PopoverClose>
+          <Button size="sm">Approve rollout</Button>
+        </div>
+        <PopoverArrow />
+      </PopoverContent>
+    </Popover>
+  );
+}
+
+function InlineComposerPopover() {
+  return (
+    <Popover>
+      <PopoverTrigger asChild>
+        <Button variant="secondary">Assign reviewer</Button>
+      </PopoverTrigger>
+      <PopoverContent side="bottom" size="md" className="grid gap-4">
+        <div className="space-y-1">
+          <h3 className="text-base font-semibold text-[var(--color-foreground)]">
+            Reviewer routing
+          </h3>
+          <p className="text-sm leading-6 text-[var(--color-muted-foreground)]">
+            Lightweight form-like content can stay in a popover when the interaction is
+            single-purpose and fast to dismiss.
+          </p>
+        </div>
+        <div className="grid gap-3">
+          <div className="grid gap-1.5">
+            <label className="text-sm font-medium text-[var(--color-foreground)]">
+              Reviewer
+            </label>
+            <Input placeholder="Search reviewer" />
+          </div>
+          <div className="grid gap-1.5">
+            <label className="text-sm font-medium text-[var(--color-foreground)]">
+              Note
+            </label>
+            <Input defaultValue="Focus on launch risk and fallback copy." />
+          </div>
+        </div>
+        <div className="flex justify-end gap-2">
+          <PopoverClose asChild>
+            <Button size="sm" variant="ghost">
+              Cancel
+            </Button>
+          </PopoverClose>
+          <Button size="sm">Send request</Button>
+        </div>
+        <PopoverArrow />
+      </PopoverContent>
+    </Popover>
+  );
+}
+
 const meta = {
   title: "Components/Popover",
   component: Popover,
@@ -125,6 +231,27 @@ export const Sizes: Story = {
   )
 };
 
+export const ComposedPanels: Story = {
+  parameters: {
+    docs: {
+      description: {
+        story:
+          "Use `padding=\"none\"` to compose richer inspector-style panels with custom header, content, and footer sections while keeping popover positioning and dismissal behavior."
+      }
+    }
+  },
+  render: () => (
+    <div className="grid w-[920px] gap-4 lg:grid-cols-[minmax(0,1.1fr)_minmax(0,0.9fr)]">
+      <div className="rounded-[var(--radius-lg)] border border-dashed border-[var(--color-border-strong)] bg-[var(--color-background)] p-8">
+        <InspectorPopover />
+      </div>
+      <div className="rounded-[var(--radius-lg)] border border-dashed border-[var(--color-border-strong)] bg-[var(--color-background)] p-8">
+        <InlineComposerPopover />
+      </div>
+    </div>
+  )
+};
+
 export const Anatomy: Story = {
   render: () => (
     <div className="w-[700px] rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 text-[var(--color-foreground)] shadow-[var(--shadow-sm)]">
@@ -132,11 +259,12 @@ export const Anatomy: Story = {
         <p className="text-xs uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]">
           Popover anatomy
         </p>
-        <SummaryPopover triggerLabel="Preview popover structure" />
+        <InspectorPopover />
         <div className="grid gap-3 text-sm leading-6 text-[var(--color-muted-foreground)]">
           <p>
             <code className="text-[var(--color-foreground)]">data-slot="content"</code> wraps
-            the floating surface and exposes <code className="text-[var(--color-foreground)]">data-size</code>.
+            the floating surface and exposes <code className="text-[var(--color-foreground)]">data-size</code> and{" "}
+            <code className="text-[var(--color-foreground)]">data-padding</code>.
           </p>
           <p>
             <code className="text-[var(--color-foreground)]">data-slot="arrow"</code> visually
@@ -170,3 +298,41 @@ export const Motion: Story = {
     </div>
   )
 };
+
+export const ContextualWorkflows: Story = {
+  parameters: {
+    docs: {
+      description: {
+        story:
+          "Popover works best for anchored context, lightweight review panels, and compact forms that should stay attached to a trigger instead of escalating to dialog."
+      }
+    }
+  },
+  render: () => (
+    <div className="grid w-[920px] gap-4 lg:grid-cols-[minmax(0,1.1fr)_minmax(0,0.9fr)]">
+      <div className="rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 shadow-[var(--shadow-sm)]">
+        <h3 className="text-lg font-semibold text-[var(--color-foreground)]">
+          Anchored release context
+        </h3>
+        <p className="mt-2 text-sm leading-6 text-[var(--color-muted-foreground)]">
+          Use a richer popover when the user needs more detail than a tooltip, but not a
+          full modal interruption.
+        </p>
+        <div className="mt-6">
+          <InspectorPopover />
+        </div>
+      </div>
+      <div className="rounded-[var(--radius-lg)] border border-[var(--color-border)] bg-[var(--color-card)] p-6 shadow-[var(--shadow-sm)]">
+        <h3 className="text-lg font-semibold text-[var(--color-foreground)]">
+          Quick assignment flow
+        </h3>
+        <p className="mt-2 text-sm leading-6 text-[var(--color-muted-foreground)]">
+          Single-purpose forms can stay lightweight and local to the trigger.
+        </p>
+        <div className="mt-6">
+          <InlineComposerPopover />
+        </div>
+      </div>
+    </div>
+  )
+};

packages/ui/src/components/combobox.test.tsx

@@ -42,7 +42,7 @@ describe("Combobox", () => {
   it("renders a selected value, filters options, and updates uncontrolled state", async () => {
     const user = userEvent.setup();
 
-    render(
+    const loadingView = render(
       <Combobox
         aria-label="Review lane"
         defaultValue="design"
@@ -163,4 +163,69 @@ describe("Combobox", () => {
     expect(trigger).toHaveAttribute("aria-describedby", expect.stringContaining(message.id));
     expect(trigger.closest("[data-slot='root']")).toHaveAttribute("data-invalid", "");
   });
+
+  it("supports loading, custom empty state, footer actions, and practical keyboard navigation", async () => {
+    const user = userEvent.setup();
+
+    const loadingView = render(
+      <Combobox
+        aria-label="Async review lane"
+        emptyMessage={(query) => `Create “${query}” as a new lane`}
+        footer={
+          <Button size="sm" variant="ghost">
+            Manage routing lanes
+          </Button>
+        }
+        items={reviewLaneItems}
+        loading
+        loadingMessage="Searching review lanes…"
+      />
+    );
+
+    const trigger = screen.getByRole("combobox", { name: "Async review lane" });
+
+    await user.click(trigger);
+    expect(screen.getByText("Searching review lanes…")).toBeInTheDocument();
+    expect(screen.getByText("Manage routing lanes")).toBeInTheDocument();
+
+    loadingView.unmount();
+
+    render(
+      <Combobox
+        aria-label="Keyboard review lane"
+        emptyMessage={(query) => `Create “${query}” as a new lane`}
+        footer={<Button size="sm">Manage routing lanes</Button>}
+        items={reviewLaneItems}
+      />
+    );
+
+    const keyboardTrigger = screen.getByRole("combobox", { name: "Keyboard review lane" });
+    await user.click(keyboardTrigger);
+
+    const searchbox = screen.getByRole("searchbox", { name: "Search options" });
+    await user.type(searchbox, "design");
+    await user.keyboard("{Escape}");
+
+    expect(searchbox).toHaveValue("");
+
+    await user.click(keyboardTrigger);
+
+    await user.keyboard("{Home}");
+    const firstOption = screen.getByRole("option", { name: /Editorial review/i });
+    expect(firstOption).toHaveAttribute("data-active", "");
+
+    await user.keyboard("{End}");
+    const lastOption = screen.getByRole("option", { name: /Legal review/i });
+    expect(lastOption).toHaveAttribute("data-active", "");
+
+    const refreshedSearchbox = screen.getByRole("searchbox", { name: "Search options" });
+    await user.clear(refreshedSearchbox);
+    await user.type(refreshedSearchbox, "security");
+    expect(screen.getByText("Create “security” as a new lane")).toBeInTheDocument();
+
+    await user.keyboard("{Tab}");
+    await waitFor(() => {
+      expect(screen.queryByRole("listbox")).not.toBeInTheDocument();
+    });
+  });
 });

packages/ui/src/components/combobox.tsx

@@ -7,7 +7,8 @@ import {
   useRef,
   useState,
   type ComponentPropsWithoutRef,
-  type KeyboardEvent
+  type KeyboardEvent,
+  type ReactNode
 } from "react";
 
 import {
@@ -18,11 +19,12 @@ import {
   comboboxLabelVariants,
   comboboxListVariants,
   comboboxSearchVariants,
-  comboboxTriggerVariants
+  comboboxTriggerVariants,
+  comboboxFooterVariants
 } from "./combobox.variants";
 import { cn } from "../lib/cn";
 import { createDataAttributes, createSlot } from "../lib/contracts";
-import { CheckIcon, ChevronDownIcon } from "../lib/icons";
+import { CheckIcon, ChevronDownIcon, SpinnerIcon } from "../lib/icons";
 import { useFieldContext } from "./field";
 
 function mergeIds(...ids: Array<string | undefined>) {
@@ -68,9 +70,13 @@ export type ComboboxProps = Omit<
   defaultOpen?: boolean;
   defaultSearchValue?: string;
   defaultValue?: string;
-  emptyMessage?: string;
+  emptyMessage?: ReactNode | ((query: string) => ReactNode);
+  filter?: (item: ComboboxItem, query: string) => boolean;
+  footer?: ReactNode;
   invalid?: boolean;
   items: ComboboxItem[];
+  loading?: boolean;
+  loadingMessage?: ReactNode;
   onOpenChange?: (open: boolean) => void;
   onSearchValueChange?: (value: string) => void;
   onValueChange?: (value: string) => void;
@@ -89,9 +95,13 @@ export const Combobox = forwardRef<HTMLButtonElement, ComboboxProps>(function Co
     defaultValue,
     disabled,
     emptyMessage = "No matching results.",
+    filter,
+    footer,
     id,
     invalid,
     items,
+    loading = false,
+    loadingMessage = "Searching…",
     onOpenChange,
     onSearchValueChange,
     onValueChange,
@@ -137,6 +147,10 @@ export const Combobox = forwardRef<HTMLButtonElement, ComboboxProps>(function Co
     }
 
     return items.filter((item) => {
+      if (filter) {
+        return filter(item, query);
+      }
+
       const haystack = [item.label, item.value, ...(item.keywords ?? [])]
         .join(" ")
         .toLowerCase();
@@ -282,10 +296,45 @@ export const Combobox = forwardRef<HTMLButtonElement, ComboboxProps>(function Co
 
     if (event.key === "Escape") {
       event.preventDefault();
+
+      if (resolvedSearchValue.length > 0) {
+        setSearchState("");
+        return;
+      }
+
+      setOpenState(false);
+      return;
+    }
+
+    if (event.key === "Home") {
+      event.preventDefault();
+      setActiveIndex(filteredItems.findIndex((item) => !item.disabled));
+      return;
+    }
+
+    if (event.key === "End") {
+      event.preventDefault();
+      const lastEnabledIndex = [...filteredItems]
+        .reverse()
+        .findIndex((item) => !item.disabled);
+
+      if (lastEnabledIndex >= 0) {
+        setActiveIndex(filteredItems.length - 1 - lastEnabledIndex);
+      }
+
+      return;
+    }
+
+    if (event.key === "Tab") {
       setOpenState(false);
     }
   };
 
+  const renderedEmptyMessage =
+    typeof emptyMessage === "function"
+      ? emptyMessage(resolvedSearchValue.trim())
+      : emptyMessage;
+
   return (
     <div
       {...createSlot("root")}
@@ -353,9 +402,16 @@ export const Combobox = forwardRef<HTMLButtonElement, ComboboxProps>(function Co
                 value={resolvedSearchValue}
               />
             </div>
-            {filteredItems.length === 0 ? (
+            {loading ? (
               <div {...createSlot("empty")} className={comboboxEmptyVariants()}>
-                {emptyMessage}
+                <span className="inline-flex items-center gap-2">
+                  <SpinnerIcon className="size-4 animate-spin" />
+                  {loadingMessage}
+                </span>
+              </div>
+            ) : filteredItems.length === 0 ? (
+              <div {...createSlot("empty")} className={comboboxEmptyVariants()}>
+                {renderedEmptyMessage}
               </div>
             ) : (
               <div
@@ -428,6 +484,11 @@ export const Combobox = forwardRef<HTMLButtonElement, ComboboxProps>(function Co
                 ))}
               </div>
             )}
+            {footer ? (
+              <div {...createSlot("footer")} className={comboboxFooterVariants()}>
+                {footer}
+              </div>
+            ) : null}
           </PopoverPrimitive.Content>
         </PopoverPrimitive.Portal>
       </PopoverPrimitive.Root>

packages/ui/src/components/combobox.variants.ts

@@ -48,3 +48,7 @@ export const comboboxItemVariants = cva([
 export const comboboxEmptyVariants = cva([
   "px-3 py-6 text-center text-sm text-[var(--color-muted-foreground)]"
 ]);
+
+export const comboboxFooterVariants = cva([
+  "border-t border-[var(--ui-panel-border)] bg-[color-mix(in_oklch,var(--ui-panel-bg)_92%,var(--color-background))] px-2 py-2"
+]);

packages/ui/src/components/command.test.tsx

@@ -4,6 +4,7 @@ import { render, screen, waitFor } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { describe, expect, it, vi } from "vitest";
 
+import { Button } from "./button";
 import {
   Command,
   CommandDialog,
@@ -96,4 +97,60 @@ describe("Command", () => {
       expect(screen.queryByPlaceholderText("Search across workspace")).not.toBeInTheDocument();
     });
   });
+
+  it("supports loading and footer content on the root command surface", async () => {
+    render(
+      <Command
+        footer={<Button size="sm">Manage commands</Button>}
+        label="Workspace palette"
+        loading
+        loadingMessage="Searching workspace…"
+      >
+        <CommandInput placeholder="Search workspace" />
+        <CommandList>
+          <CommandEmpty>No matching items.</CommandEmpty>
+        </CommandList>
+      </Command>
+    );
+
+    expect(screen.getByText("Searching workspace…")).toHaveAttribute("data-slot", "loading");
+    expect(screen.getByText("Manage commands")).toBeInTheDocument();
+  });
+
+  it("supports dialog title, description, and footer actions for a practical palette shell", async () => {
+    const user = userEvent.setup();
+
+    function CommandDialogExample() {
+      const [open, setOpen] = useState(true);
+
+      return (
+        <CommandDialog
+          description="Jump to docs, recent launches, and operational shortcuts."
+          footer={<Button size="sm">Manage shortcuts</Button>}
+          onOpenChange={setOpen}
+          open={open}
+          title="Workspace command palette"
+        >
+          <CommandInput placeholder="Search across workspace" />
+          <CommandList>
+            <CommandGroup heading="Recent">
+              <CommandItem value="recent-release">Recent release brief</CommandItem>
+            </CommandGroup>
+          </CommandList>
+        </CommandDialog>
+      );
+    }
+
+    render(<CommandDialogExample />);
+
+    expect(screen.getByText("Workspace command palette")).toBeInTheDocument();
+    expect(screen.getByText("Jump to docs, recent launches, and operational shortcuts.")).toBeInTheDocument();
+    expect(screen.getByText("Manage shortcuts")).toBeInTheDocument();
+
+    await user.click(screen.getByRole("button", { name: "Close dialog" }));
+
+    await waitFor(() => {
+      expect(screen.queryByText("Workspace command palette")).not.toBeInTheDocument();
+    });
+  });
 });

packages/ui/src/components/command.tsx

@@ -10,16 +10,24 @@ import {
 import {
   commandDialogContentVariants,
   commandEmptyVariants,
+  commandFooterVariants,
   commandGroupVariants,
   commandInputVariants,
   commandInputWrapperVariants,
   commandItemVariants,
   commandListVariants,
+  commandLoadingVariants,
   commandSeparatorVariants,
   commandShortcutVariants,
   commandVariants
 } from "./command.variants";
-import { DialogContent } from "./dialog";
+import {
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle
+} from "./dialog";
 import { cn } from "../lib/cn";
 import { createDataAttributes, createSlot } from "../lib/contracts";
 
@@ -38,17 +46,49 @@ function SearchIcon() {
   );
 }
 
-export type CommandProps = ComponentPropsWithoutRef<typeof CommandPrimitive>;
+export type CommandProps = ComponentPropsWithoutRef<typeof CommandPrimitive> & {
+  footer?: ReactNode;
+  loading?: boolean;
+  loadingMessage?: ReactNode;
+};
 
 export const Command = forwardRef<ElementRef<typeof CommandPrimitive>, CommandProps>(
-  function Command({ className, ...props }, ref) {
+  function Command(
+    {
+      children,
+      className,
+      footer,
+      loading = false,
+      loadingMessage = "Loading results…",
+      ...props
+    },
+    ref
+  ) {
     return (
       <CommandPrimitive
         {...props}
         {...createSlot("root")}
         className={cn(commandVariants(), className)}
         ref={ref}
-      />
+      >
+        {loading ? (
+          <div
+            {...createSlot("loading")}
+            className={commandLoadingVariants()}
+          >
+            {loadingMessage}
+          </div>
+        ) : null}
+        {children}
+        {footer ? (
+          <div
+            {...createSlot("footer")}
+            className={commandFooterVariants()}
+          >
+            {footer}
+          </div>
+        ) : null}
+      </CommandPrimitive>
     );
   }
 );
@@ -57,18 +97,45 @@ export type CommandDialogProps = ComponentPropsWithoutRef<typeof DialogPrimitive
   children?: ReactNode;
   contentClassName?: string;
   commandClassName?: string;
+  description?: ReactNode;
+  footer?: ReactNode;
+  loading?: boolean;
+  loadingMessage?: ReactNode;
+  title?: ReactNode;
 };
 
 export function CommandDialog({
   children,
   commandClassName,
   contentClassName,
+  description,
+  footer,
+  loading,
+  loadingMessage,
+  title,
   ...props
 }: CommandDialogProps) {
   return (
     <DialogPrimitive.Root {...props}>
       <DialogContent className={cn(commandDialogContentVariants(), contentClassName)}>
-        <Command className={commandClassName}>{children}</Command>
+        {title || description ? (
+          <DialogHeader className="border-b border-[var(--ui-panel-border)] px-4 py-4">
+            {title ? <DialogTitle>{title}</DialogTitle> : null}
+            {description ? <DialogDescription>{description}</DialogDescription> : null}
+          </DialogHeader>
+        ) : null}
+        <Command
+          className={commandClassName}
+          footer={
+            footer ? (
+              <DialogFooter className="p-0">{footer}</DialogFooter>
+            ) : undefined
+          }
+          loading={loading}
+          loadingMessage={loadingMessage}
+        >
+          {children}
+        </Command>
       </DialogContent>
     </DialogPrimitive.Root>
   );

packages/ui/src/components/command.variants.ts

@@ -25,6 +25,10 @@ export const commandListVariants = cva([
   "max-h-[22rem] overflow-y-auto overflow-x-hidden p-2"
 ]);
 
+export const commandLoadingVariants = cva([
+  "px-4 py-8 text-sm text-[var(--color-muted-foreground)]"
+]);
+
 export const commandEmptyVariants = cva([
   "py-10 text-center text-sm text-[var(--color-muted-foreground)]"
 ]);
@@ -51,3 +55,7 @@ export const commandSeparatorVariants = cva([
 export const commandShortcutVariants = cva([
   "ml-auto text-[0.7rem] uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]"
 ]);
+
+export const commandFooterVariants = cva([
+  "border-t border-[var(--ui-panel-border)] bg-[color-mix(in_oklch,var(--ui-panel-bg)_94%,var(--color-background))] px-4 py-3"
+]);

packages/ui/src/components/data-table.test.tsx

@@ -239,4 +239,81 @@ describe("DataTable", () => {
     expect(onSortingChange).toHaveBeenCalledWith([{ desc: false, id: "lane" }]);
     expect(onSelectionChange).toHaveBeenCalledWith({ support: true });
   });
+
+  it("toggles hideable columns from the built-in view menu", async () => {
+    const user = userEvent.setup();
+
+    render(
+      <DataTable
+        columns={[
+          {
+            accessor: "lane",
+            header: "Lane",
+            hideable: false,
+            id: "lane"
+          },
+          {
+            accessor: "owner",
+            header: "Owner",
+            hideable: true,
+            id: "owner"
+          }
+        ]}
+        rows={rows.slice(0, 2)}
+      />
+    );
+
+    expect(screen.getByRole("columnheader", { name: /owner/i })).toBeInTheDocument();
+
+    await user.click(screen.getByRole("button", { name: "View" }));
+    await user.click(screen.getByRole("menuitemcheckbox", { name: "Owner" }));
+
+    expect(screen.queryByRole("columnheader", { name: /owner/i })).not.toBeInTheDocument();
+    expect(screen.queryByText("Ava")).not.toBeInTheDocument();
+  });
+
+  it("switches density from the built-in view menu", async () => {
+    const user = userEvent.setup();
+
+    render(<DataTable columns={columns} rows={rows.slice(0, 2)} />);
+
+    const root = screen.getByRole("table").closest('[data-slot="root"]');
+    expect(root).toHaveAttribute("data-density", "comfortable");
+
+    await user.click(screen.getByRole("button", { name: "View" }));
+    await user.click(screen.getByRole("menuitemradio", { name: "Compact" }));
+
+    expect(root).toHaveAttribute("data-density", "compact");
+    expect(screen.getByRole("columnheader", { name: /lane/i })).toHaveAttribute(
+      "data-density",
+      "compact"
+    );
+  });
+
+  it("opens row details inside a sheet", async () => {
+    const user = userEvent.setup();
+
+    render(
+      <DataTable
+        columns={columns}
+        renderRowDetails={(row) => <div>{row.note}</div>}
+        rowDetailsDescription={(row) => `${row.lane} handoff`}
+        rowDetailsTitle={(row) => `${row.lane} detail`}
+        rows={rows.slice(0, 2)}
+      />
+    );
+
+    await user.click(screen.getAllByRole("button", { name: "Open details" })[0]);
+
+    const detailHeading = await screen.findByText("Legal detail");
+    const sheet = detailHeading.closest('[data-slot="content"]');
+
+    expect(detailHeading).toBeInTheDocument();
+    expect(screen.getByText("Legal handoff")).toBeInTheDocument();
+    expect(
+      within(sheet as HTMLElement).getByText(
+        "Footnote needs one more pass before the customer note goes out."
+      )
+    ).toBeInTheDocument();
+  });
 });

packages/ui/src/components/data-table.tsx

@@ -26,6 +26,16 @@ import {
 
 import { Button } from "./button";
 import { Checkbox } from "./checkbox";
+import {
+  DropdownMenu,
+  DropdownMenuCheckboxItem,
+  DropdownMenuContent,
+  DropdownMenuLabel,
+  DropdownMenuRadioGroup,
+  DropdownMenuRadioItem,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger
+} from "./dropdown-menu";
 import {
   EmptyState,
   EmptyStateActions,
@@ -34,6 +44,13 @@ import {
   EmptyStateTitle
 } from "./empty-state";
 import { Input, type InputProps } from "./input";
+import {
+  Sheet,
+  SheetContent,
+  SheetDescription,
+  SheetHeader,
+  SheetTitle
+} from "./sheet";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "./select";
 import { Skeleton } from "./skeleton";
 import { Spinner } from "./spinner";
@@ -62,6 +79,7 @@ import {
 } from "./data-table.variants";
 
 export type DataTableAlignment = "start" | "center" | "end";
+export type DataTableDensity = "comfortable" | "compact";
 
 export type DataTableSort = {
   desc?: boolean;
@@ -78,6 +96,7 @@ export type DataTableColumn<TData> = {
   align?: DataTableAlignment;
   cell?: (row: TData) => ReactNode;
   header: ReactNode | ((column: DataTableColumnContext<TData>) => ReactNode);
+  hideable?: boolean;
   id: string;
   searchValue?: (row: TData) => string;
   searchable?: boolean;
@@ -87,25 +106,34 @@ export type DataTableColumn<TData> = {
 
 export type DataTableProps<TData> = Omit<ComponentPropsWithoutRef<"div">, "children"> & {
   columns: DataTableColumn<TData>[];
+  defaultDensity?: DataTableDensity;
   defaultPageIndex?: number;
   defaultPageSize?: number;
   defaultSearchValue?: string;
   defaultSelection?: Record<string, boolean>;
   defaultSorting?: DataTableSort[];
+  defaultVisibleColumns?: Record<string, boolean>;
+  density?: DataTableDensity;
   empty?: ReactNode;
   enableSelection?: boolean;
   getRowId?: (row: TData, index: number) => string;
   loading?: boolean;
   loadingRowCount?: number;
+  onDensityChange?: (density: DataTableDensity) => void;
   onPageIndexChange?: (pageIndex: number) => void;
   onPageSizeChange?: (pageSize: number) => void;
   onSearchValueChange?: (searchValue: string) => void;
   onSelectionChange?: (selection: Record<string, boolean>) => void;
   onSortingChange?: (sorting: DataTableSort[]) => void;
+  onVisibleColumnsChange?: (visibility: Record<string, boolean>) => void;
   pageIndex?: number;
   pageSize?: number;
   pageSizeOptions?: number[];
+  renderRowDetails?: (row: TData) => ReactNode;
   renderRowActions?: (row: TData) => ReactNode;
+  rowDetailsDescription?: ReactNode | ((row: TData) => ReactNode);
+  rowDetailsLabel?: string;
+  rowDetailsTitle?: ReactNode | ((row: TData) => ReactNode);
   rows: TData[];
   searchLabel?: string;
   searchPlaceholder?: string;
@@ -116,6 +144,7 @@ export type DataTableProps<TData> = Omit<ComponentPropsWithoutRef<"div">, "child
   sorting?: DataTableSort[];
   tableLabel?: string;
   toolbarActions?: ReactNode;
+  visibleColumns?: Record<string, boolean>;
 };
 
 type InternalColumnMeta<TData> = {
@@ -212,25 +241,34 @@ function DataTableInner<TData>(
   {
     className,
     columns,
+    defaultDensity = "comfortable",
     defaultPageIndex = 0,
     defaultPageSize = 5,
     defaultSearchValue = "",
     defaultSelection = {},
     defaultSorting = [],
+    defaultVisibleColumns = {},
+    density,
     empty,
     enableSelection = false,
     getRowId,
     loading = false,
     loadingRowCount = 5,
+    onDensityChange,
     onPageIndexChange,
     onPageSizeChange,
     onSearchValueChange,
     onSelectionChange,
     onSortingChange,
+    onVisibleColumnsChange,
     pageIndex,
     pageSize,
     pageSizeOptions = [5, 10, 20],
+    renderRowDetails,
     renderRowActions,
+    rowDetailsDescription,
+    rowDetailsLabel = "Open details",
+    rowDetailsTitle,
     rows,
     searchLabel = "Search rows",
     searchPlaceholder = "Search rows",
@@ -241,6 +279,7 @@ function DataTableInner<TData>(
     sorting,
     tableLabel = "Data table",
     toolbarActions,
+    visibleColumns,
     ...props
   }: DataTableProps<TData>,
   ref: ForwardedRef<HTMLDivElement>
@@ -275,6 +314,19 @@ function DataTableInner<TData>(
     defaultValue: defaultPageSize,
     onChange: onPageSizeChange
   });
+  const [currentDensity, setCurrentDensity] = useControllableState<DataTableDensity>({
+    controlledValue: density,
+    defaultValue: defaultDensity,
+    onChange: onDensityChange
+  });
+  const [currentVisibleColumns, setCurrentVisibleColumns] = useControllableState<
+    Record<string, boolean>
+  >({
+    controlledValue: visibleColumns,
+    defaultValue: defaultVisibleColumns,
+    onChange: onVisibleColumnsChange
+  });
+  const [detailRowId, setDetailRowId] = useState<string | null>(null);
 
   const resolvedPageSizeOptions = [...new Set([...pageSizeOptions, currentPageSize])].sort(
     (left, right) => left - right
@@ -325,6 +377,34 @@ function DataTableInner<TData>(
           } satisfies ColumnDef<TData>
         ]
       : []),
+    ...(renderRowDetails
+      ? [
+          {
+            cell: ({ row }) => (
+              <div {...createSlot("actions")} className="flex items-center justify-end">
+                <Button
+                  size="sm"
+                  variant="ghost"
+                  onClick={() => {
+                    setDetailRowId(row.id);
+                  }}
+                >
+                  {rowDetailsLabel}
+                </Button>
+              </div>
+            ),
+            enableGlobalFilter: false,
+            enableHiding: false,
+            enableSorting: false,
+            header: () => <span className="sr-only">Row details</span>,
+            id: "__details",
+            meta: {
+              align: "end",
+              width: 108
+            } satisfies InternalColumnMeta<TData>
+          } satisfies ColumnDef<TData>
+        ]
+      : []),
     ...columns.map((column) => ({
       accessorFn: column.accessor
         ? (row: TData) => getColumnAccessorValue(row, column)
@@ -334,6 +414,7 @@ function DataTableInner<TData>(
           ? column.cell(row.original)
           : stringifySearchValue(getColumnAccessorValue(row.original, column)),
       enableGlobalFilter: searchableColumns.includes(column),
+      enableHiding: column.hideable ?? true,
       enableSorting: column.sortable ?? false,
       header: ({ column: tanstackColumn }: HeaderContext<TData, unknown>) =>
         typeof column.header === "function"
@@ -424,12 +505,21 @@ function DataTableInner<TData>(
 
       setCurrentSorting(nextValue.map((item) => ({ desc: item.desc, id: item.id })));
     },
+    onColumnVisibilityChange: (updater) => {
+      const nextValue =
+        typeof updater === "function"
+          ? updater(currentVisibleColumns)
+          : updater;
+
+      setCurrentVisibleColumns(nextValue);
+    },
     state: {
       globalFilter: currentSearchValue,
       pagination: {
         pageIndex: currentPageIndex,
         pageSize: currentPageSize
       } satisfies PaginationState,
+      columnVisibility: currentVisibleColumns,
       rowSelection: currentSelection,
       sorting: currentSorting as SortingState
     }
@@ -437,11 +527,16 @@ function DataTableInner<TData>(
 
   const totalColumns = table.getAllLeafColumns().length;
   const filteredRowCount = table.getFilteredRowModel().rows.length;
+  const hideableColumns = table
+    .getAllLeafColumns()
+    .filter((column) => !column.id.startsWith("__") && column.getCanHide());
   const selectedRows = table.getSelectedRowModel().rows.map((row) => row.original);
   const pageCount = table.getPageCount();
   const isEmpty = !loading && filteredRowCount === 0;
   const shouldRenderSearch = searchableColumns.length > 0;
-  const shouldRenderToolbar = shouldRenderSearch || toolbarActions !== undefined;
+  const shouldRenderViewOptions = hideableColumns.length > 0;
+  const shouldRenderToolbar =
+    shouldRenderSearch || toolbarActions !== undefined || shouldRenderViewOptions;
   const pageStart =
     filteredRowCount === 0 ? 0 : currentPageIndex * currentPageSize + 1;
   const pageEnd = Math.min((currentPageIndex + 1) * currentPageSize, filteredRowCount);
@@ -454,6 +549,25 @@ function DataTableInner<TData>(
     }
   }, [currentPageIndex, pageCount, setCurrentPageIndex]);
 
+  const detailRow = renderRowDetails
+    ? table.getPrePaginationRowModel().rows.find((row) => row.id === detailRowId)
+    : undefined;
+  const detailRowOriginal = detailRow?.original;
+  const resolvedDetailTitle =
+    detailRowOriginal && rowDetailsTitle
+      ? typeof rowDetailsTitle === "function"
+        ? rowDetailsTitle(detailRowOriginal)
+        : rowDetailsTitle
+      : detailRowOriginal
+        ? "Row details"
+        : null;
+  const resolvedDetailDescription =
+    detailRowOriginal && rowDetailsDescription
+      ? typeof rowDetailsDescription === "function"
+        ? rowDetailsDescription(detailRowOriginal)
+        : rowDetailsDescription
+      : null;
+
   return (
     <div
       {...props}
@@ -464,6 +578,7 @@ function DataTableInner<TData>(
         selected: selectedRows.length > 0
       })}
       className={cn(dataTableRootVariants(), className)}
+      data-density={currentDensity}
       ref={ref}
     >
       {shouldRenderToolbar ? (
@@ -483,7 +598,53 @@ function DataTableInner<TData>(
               </div>
             ) : null}
           </div>
-          {toolbarActions ? <DataTableFilters>{toolbarActions}</DataTableFilters> : null}
+          <DataTableFilters>
+            {toolbarActions}
+            {shouldRenderViewOptions ? (
+              <DropdownMenu>
+                <DropdownMenuTrigger asChild>
+                  <Button size="sm" variant="subtle">
+                    View
+                  </Button>
+                </DropdownMenuTrigger>
+                <DropdownMenuContent align="end">
+                  <DropdownMenuLabel>Density</DropdownMenuLabel>
+                  <DropdownMenuRadioGroup
+                    value={currentDensity}
+                    onValueChange={(value) => {
+                      setCurrentDensity(value as DataTableDensity);
+                    }}
+                  >
+                    <DropdownMenuRadioItem value="comfortable">
+                      Comfortable
+                    </DropdownMenuRadioItem>
+                    <DropdownMenuRadioItem value="compact">
+                      Compact
+                    </DropdownMenuRadioItem>
+                  </DropdownMenuRadioGroup>
+                  <DropdownMenuSeparator />
+                  <DropdownMenuLabel>Columns</DropdownMenuLabel>
+                  {hideableColumns.map((column) => {
+                    const meta = column.columnDef.meta as InternalColumnMeta<TData> | undefined;
+                    const label =
+                      meta?.sourceColumn ? getHeaderLabel(meta.sourceColumn) : column.id;
+
+                    return (
+                      <DropdownMenuCheckboxItem
+                        checked={column.getIsVisible()}
+                        key={column.id}
+                        onCheckedChange={(checked) => {
+                          column.toggleVisibility(Boolean(checked));
+                        }}
+                      >
+                        {label}
+                      </DropdownMenuCheckboxItem>
+                    );
+                  })}
+                </DropdownMenuContent>
+              </DropdownMenu>
+            ) : null}
+          </DataTableFilters>
         </DataTableToolbar>
       ) : null}
 
@@ -533,6 +694,7 @@ function DataTableInner<TData>(
                               : undefined
                         }
                         scope="col"
+                        density={currentDensity}
                         sortable={header.column.getCanSort()}
                         sort={sortState}
                         style={getColumnWidthStyle(meta?.width)}
@@ -618,6 +780,7 @@ function DataTableInner<TData>(
                           return (
                             <DataTableCell
                               align={align}
+                              density={currentDensity}
                               key={cell.id}
                               style={getColumnWidthStyle(meta?.width)}
                             >
@@ -690,6 +853,27 @@ function DataTableInner<TData>(
           </div>
         </DataTablePagination>
       </DataTableContent>
+
+      {renderRowDetails && detailRowOriginal ? (
+        <Sheet
+          open={detailRowId !== null}
+          onOpenChange={(nextOpen) => {
+            if (!nextOpen) {
+              setDetailRowId(null);
+            }
+          }}
+        >
+          <SheetContent size="lg">
+            <SheetHeader>
+              <SheetTitle>{resolvedDetailTitle}</SheetTitle>
+              {resolvedDetailDescription ? (
+                <SheetDescription>{resolvedDetailDescription}</SheetDescription>
+              ) : null}
+            </SheetHeader>
+            <div className="mt-6">{renderRowDetails(detailRowOriginal)}</div>
+          </SheetContent>
+        </Sheet>
+      ) : null}
     </div>
   );
 }
@@ -787,12 +971,20 @@ export const DataTableHeader = forwardRef<HTMLTableSectionElement, DataTableHead
 
 export type DataTableHeaderCellProps = Omit<ComponentPropsWithoutRef<"th">, "align"> &
   VariantProps<typeof dataTableHeaderCellVariants> & {
+    density?: DataTableDensity;
     sort?: "asc" | "desc" | false;
   };
 
 export const DataTableHeaderCell = forwardRef<HTMLTableCellElement, DataTableHeaderCellProps>(
   function DataTableHeaderCell(
-    { align = "start", className, sort = false, sortable = false, ...props },
+    {
+      align = "start",
+      className,
+      density = "comfortable",
+      sort = false,
+      sortable = false,
+      ...props
+    },
     ref
   ) {
     return (
@@ -800,9 +992,10 @@ export const DataTableHeaderCell = forwardRef<HTMLTableCellElement, DataTableHea
         {...props}
         {...createSlot("header")}
         {...createDataAttributes({
+          density,
           sort: sort || undefined
         })}
-        className={cn(dataTableHeaderCellVariants({ align, sortable }), className)}
+        className={cn(dataTableHeaderCellVariants({ align, density, sortable }), className)}
         ref={ref}
       />
     );
@@ -846,15 +1039,20 @@ export const DataTableRow = forwardRef<HTMLTableRowElement, DataTableRowProps>(
 );
 
 export type DataTableCellProps = Omit<ComponentPropsWithoutRef<"td">, "align"> &
-  VariantProps<typeof dataTableCellVariants>;
+  VariantProps<typeof dataTableCellVariants> & {
+    density?: DataTableDensity;
+  };
 
 export const DataTableCell = forwardRef<HTMLTableCellElement, DataTableCellProps>(
-  function DataTableCell({ align = "start", className, ...props }, ref) {
+  function DataTableCell(
+    { align = "start", className, density = "comfortable", ...props },
+    ref
+  ) {
     return (
       <td
         {...props}
         {...createSlot("cell")}
-        className={cn(dataTableCellVariants({ align }), className)}
+        className={cn(dataTableCellVariants({ align, density }), className)}
         ref={ref}
       />
     );

packages/ui/src/components/data-table.variants.ts

@@ -33,7 +33,7 @@ export const dataTableHeaderVariants = cva(
 
 export const dataTableHeaderCellVariants = cva(
   [
-    "px-4 py-3 text-sm font-medium uppercase tracking-[var(--tracking-caps)]",
+    "px-4 text-sm font-medium uppercase tracking-[var(--tracking-caps)]",
     "text-[var(--color-muted-foreground)]"
   ],
   {
@@ -43,6 +43,10 @@ export const dataTableHeaderCellVariants = cva(
         center: "text-center",
         end: "text-right"
       },
+      density: {
+        comfortable: "py-3",
+        compact: "py-2.5 text-xs"
+      },
       sortable: {
         false: "",
         true: "select-none"
@@ -50,6 +54,7 @@ export const dataTableHeaderCellVariants = cva(
     },
     defaultVariants: {
       align: "start",
+      density: "comfortable",
       sortable: false
     }
   }
@@ -81,17 +86,22 @@ export const dataTableRowVariants = cva(
 );
 
 export const dataTableCellVariants = cva(
-  "px-4 py-3 text-sm leading-6 text-[var(--color-card-foreground)]",
+  "px-4 text-[var(--color-card-foreground)]",
   {
     variants: {
       align: {
         start: "text-left",
         center: "text-center",
         end: "text-right"
+      },
+      density: {
+        comfortable: "py-3 text-sm leading-6",
+        compact: "py-2.5 text-[0.8125rem] leading-5"
       }
     },
     defaultVariants: {
-      align: "start"
+      align: "start",
+      density: "comfortable"
     }
   }
 );

packages/ui/src/components/dropdown-menu.test.tsx

@@ -12,6 +12,9 @@ import {
   DropdownMenuRadioItem,
   DropdownMenuSeparator,
   DropdownMenuShortcut,
+  DropdownMenuSub,
+  DropdownMenuSubTrigger,
+  DropdownMenuSubContent,
   DropdownMenuTrigger
 } from "./dropdown-menu";
 
@@ -58,6 +61,52 @@ describe("DropdownMenu", () => {
     expect(onSelect).toHaveBeenCalledTimes(1);
   });
 
+  it("renders richer row content such as leading icons, descriptions, shortcuts, and submenu descriptions", async () => {
+    const user = userEvent.setup();
+
+    render(
+      <DropdownMenu>
+        <DropdownMenuTrigger>Open menu</DropdownMenuTrigger>
+        <DropdownMenuContent size="xl">
+          <DropdownMenuItem
+            description="Inspect the latest reviewer summary."
+            leading={<span data-testid="leading-icon">•</span>}
+            shortcut="R"
+          >
+            Review summary
+          </DropdownMenuItem>
+          <DropdownMenuSub>
+            <DropdownMenuSubTrigger description="Open more contextual actions.">
+              More actions
+            </DropdownMenuSubTrigger>
+            <DropdownMenuSubContent>
+              <DropdownMenuItem description="Archive this release safely.">
+                Archive release
+              </DropdownMenuItem>
+            </DropdownMenuSubContent>
+          </DropdownMenuSub>
+        </DropdownMenuContent>
+      </DropdownMenu>
+    );
+
+    await user.click(screen.getByRole("button", { name: "Open menu" }));
+
+    const menu = await screen.findByRole("menu");
+    expect(menu).toHaveAttribute("data-size", "xl");
+    expect(screen.getByTestId("leading-icon").closest('[data-slot="leading"]')).toBeInTheDocument();
+    expect(screen.getByText("Inspect the latest reviewer summary.")).toHaveAttribute(
+      "data-slot",
+      "description"
+    );
+    expect(screen.getByText("R")).toHaveAttribute("data-slot", "shortcut");
+
+    await user.hover(screen.getByText("More actions"));
+    expect(await screen.findByText("Open more contextual actions.")).toHaveAttribute(
+      "data-slot",
+      "description"
+    );
+  });
+
   it("closes on Escape and supports controlled opening", async () => {
     const user = userEvent.setup();
     const onOpenChange = vi.fn();

packages/ui/src/components/dropdown-menu.tsx

@@ -3,12 +3,18 @@ import {
   forwardRef,
   type ComponentPropsWithoutRef,
   type ElementRef,
-  type HTMLAttributes
+  type HTMLAttributes,
+  type PropsWithChildren,
+  type ReactNode
 } from "react";
 
 import {
   dropdownMenuContentVariants,
+  dropdownMenuItemBodyVariants,
+  dropdownMenuItemDescriptionVariants,
   dropdownMenuItemVariants,
+  dropdownMenuItemLabelVariants,
+  dropdownMenuItemLeadingVariants,
   dropdownMenuLabelVariants,
   dropdownMenuSeparatorVariants
 } from "./dropdown-menu.variants";
@@ -24,6 +30,52 @@ export const DropdownMenuPortal = DropdownMenuPrimitive.Portal;
 export const DropdownMenuSub = DropdownMenuPrimitive.Sub;
 export const DropdownMenuRadioGroup = DropdownMenuPrimitive.RadioGroup;
 
+type DropdownMenuRichItemProps = {
+  description?: ReactNode;
+  leading?: ReactNode;
+  shortcut?: ReactNode;
+};
+
+function DropdownMenuItemContent({
+  children,
+  description,
+  leading,
+  shortcut
+}: PropsWithChildren<DropdownMenuRichItemProps>) {
+  return (
+    <>
+      {leading ? (
+        <span
+          {...createSlot("leading")}
+          className={cn(dropdownMenuItemLeadingVariants())}
+        >
+          {leading}
+        </span>
+      ) : null}
+      <span
+        {...createSlot("body")}
+        className={cn(dropdownMenuItemBodyVariants())}
+      >
+        <span
+          {...createSlot("label")}
+          className={cn(dropdownMenuItemLabelVariants())}
+        >
+          {children}
+        </span>
+        {description ? (
+          <span
+            {...createSlot("description")}
+            className={cn(dropdownMenuItemDescriptionVariants())}
+          >
+            {description}
+          </span>
+        ) : null}
+      </span>
+      {shortcut ? <DropdownMenuShortcut>{shortcut}</DropdownMenuShortcut> : null}
+    </>
+  );
+}
+
 export type DropdownMenuContentProps =
   ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.Content> &
     VariantProps<typeof dropdownMenuContentVariants>;
@@ -76,13 +128,14 @@ export const DropdownMenuSubContent = forwardRef<
 
 export type DropdownMenuItemProps =
   ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.Item> &
-    VariantProps<typeof dropdownMenuItemVariants>;
+    VariantProps<typeof dropdownMenuItemVariants> &
+    DropdownMenuRichItemProps;
 
 export const DropdownMenuItem = forwardRef<
   ElementRef<typeof DropdownMenuPrimitive.Item>,
   DropdownMenuItemProps
 >(function DropdownMenuItem(
-  { className, inset, variant, ...props },
+  { children, className, description, inset, leading, shortcut, variant, ...props },
   ref
 ) {
   return (
@@ -92,19 +145,37 @@ export const DropdownMenuItem = forwardRef<
       {...createDataAttributes({ inset, variant })}
       className={cn(dropdownMenuItemVariants({ inset, variant }), className)}
       ref={ref}
-    />
+    >
+      <DropdownMenuItemContent
+        description={description}
+        leading={leading}
+        shortcut={shortcut}
+      >
+        {children}
+      </DropdownMenuItemContent>
+    </DropdownMenuPrimitive.Item>
   );
 });
 
 export type DropdownMenuCheckboxItemProps =
   ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.CheckboxItem> &
-    VariantProps<typeof dropdownMenuItemVariants>;
+    VariantProps<typeof dropdownMenuItemVariants> &
+    Omit<DropdownMenuRichItemProps, "leading">;
 
 export const DropdownMenuCheckboxItem = forwardRef<
   ElementRef<typeof DropdownMenuPrimitive.CheckboxItem>,
   DropdownMenuCheckboxItemProps
 >(function DropdownMenuCheckboxItem(
-  { checked, children, className, inset = true, variant, ...props },
+  {
+    checked,
+    children,
+    className,
+    description,
+    inset = true,
+    shortcut,
+    variant,
+    ...props
+  },
   ref
 ) {
   return (
@@ -124,20 +195,34 @@ export const DropdownMenuCheckboxItem = forwardRef<
           <CheckIcon className="size-3" />
         </DropdownMenuPrimitive.ItemIndicator>
       </span>
+      <DropdownMenuItemContent
+        description={description}
+        shortcut={shortcut}
+      >
         {children}
+      </DropdownMenuItemContent>
     </DropdownMenuPrimitive.CheckboxItem>
   );
 });
 
 export type DropdownMenuRadioItemProps =
   ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.RadioItem> &
-    VariantProps<typeof dropdownMenuItemVariants>;
+    VariantProps<typeof dropdownMenuItemVariants> &
+    Omit<DropdownMenuRichItemProps, "leading">;
 
 export const DropdownMenuRadioItem = forwardRef<
   ElementRef<typeof DropdownMenuPrimitive.RadioItem>,
   DropdownMenuRadioItemProps
 >(function DropdownMenuRadioItem(
-  { children, className, inset = true, variant, ...props },
+  {
+    children,
+    className,
+    description,
+    inset = true,
+    shortcut,
+    variant,
+    ...props
+  },
   ref
 ) {
   return (
@@ -156,7 +241,12 @@ export const DropdownMenuRadioItem = forwardRef<
           <DotIcon className="size-2.5" />
         </DropdownMenuPrimitive.ItemIndicator>
       </span>
+      <DropdownMenuItemContent
+        description={description}
+        shortcut={shortcut}
+      >
         {children}
+      </DropdownMenuItemContent>
     </DropdownMenuPrimitive.RadioItem>
   );
 });
@@ -196,13 +286,14 @@ export const DropdownMenuSeparator = forwardRef<
 
 export type DropdownMenuSubTriggerProps =
   ComponentPropsWithoutRef<typeof DropdownMenuPrimitive.SubTrigger> &
-    VariantProps<typeof dropdownMenuItemVariants>;
+    VariantProps<typeof dropdownMenuItemVariants> &
+    Pick<DropdownMenuRichItemProps, "description">;
 
 export const DropdownMenuSubTrigger = forwardRef<
   ElementRef<typeof DropdownMenuPrimitive.SubTrigger>,
   DropdownMenuSubTriggerProps
 >(function DropdownMenuSubTrigger(
-  { children, className, inset, variant, ...props },
+  { children, className, description, inset, variant, ...props },
   ref
 ) {
   return (
@@ -212,8 +303,26 @@ export const DropdownMenuSubTrigger = forwardRef<
       {...createDataAttributes({ inset, variant })}
       className={cn(dropdownMenuItemVariants({ inset, variant }), className)}
       ref={ref}
+    >
+      <span
+        {...createSlot("body")}
+        className={cn(dropdownMenuItemBodyVariants())}
+      >
+        <span
+          {...createSlot("label")}
+          className={cn(dropdownMenuItemLabelVariants())}
         >
           {children}
+        </span>
+        {description ? (
+          <span
+            {...createSlot("description")}
+            className={cn(dropdownMenuItemDescriptionVariants())}
+          >
+            {description}
+          </span>
+        ) : null}
+      </span>
       <ChevronRightIcon className="ml-auto size-3 text-[var(--color-muted-foreground)]" />
     </DropdownMenuPrimitive.SubTrigger>
   );

packages/ui/src/components/dropdown-menu.variants.ts

@@ -12,7 +12,8 @@ export const dropdownMenuContentVariants = cva(
       size: {
         sm: "min-w-[11rem]",
         md: "min-w-[13rem]",
-        lg: "min-w-[15rem]"
+        lg: "min-w-[15rem]",
+        xl: "min-w-[18rem]"
       }
     },
     defaultVariants: {
@@ -23,7 +24,7 @@ export const dropdownMenuContentVariants = cva(
 
 export const dropdownMenuItemVariants = cva(
   [
-    "relative flex cursor-default select-none items-center gap-2 rounded-[var(--ui-control-radius)] px-2.5 py-2 text-sm outline-none",
+    "relative flex min-w-0 cursor-default select-none items-center gap-2 rounded-[var(--ui-control-radius)] px-2.5 py-2 text-sm outline-none",
     "text-[var(--color-foreground)] transition-colors duration-[var(--dur-fast)] ease-[var(--ease-standard)]",
     "focus:bg-[var(--ui-control-bg)] focus:text-[var(--color-foreground)] data-[highlighted]:bg-[var(--ui-control-bg)] data-[highlighted]:text-[var(--color-foreground)]",
     "data-[disabled]:pointer-events-none data-[disabled]:opacity-45"
@@ -47,6 +48,22 @@ export const dropdownMenuItemVariants = cva(
   }
 );
 
+export const dropdownMenuItemBodyVariants = cva([
+  "grid min-w-0 flex-1 gap-0.5"
+]);
+
+export const dropdownMenuItemLabelVariants = cva([
+  "truncate text-sm font-medium text-[var(--color-foreground)]"
+]);
+
+export const dropdownMenuItemDescriptionVariants = cva([
+  "text-xs leading-5 text-[var(--color-muted-foreground)]"
+]);
+
+export const dropdownMenuItemLeadingVariants = cva([
+  "inline-flex size-4 shrink-0 items-center justify-center text-[var(--color-muted-foreground)]"
+]);
+
 export const dropdownMenuLabelVariants = cva(
   [
     "px-2.5 py-2 text-xs font-medium uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]"

packages/ui/src/components/empty-state.test.tsx

@@ -56,4 +56,52 @@ describe("EmptyState", () => {
       "items-start"
     );
   });
+
+  it("supports compact and split layout variants with slot metadata", () => {
+    render(
+      <>
+        <EmptyState
+          align="start"
+          data-testid="compact"
+          layout="compact"
+          tone="default"
+        >
+          <EmptyStateMedia size="compact">Q1</EmptyStateMedia>
+          <EmptyStateHeader align="start">
+            <EmptyStateTitle>No queue activity</EmptyStateTitle>
+          </EmptyStateHeader>
+          <EmptyStateActions layout="stack">
+            <Button size="sm">Create task</Button>
+          </EmptyStateActions>
+        </EmptyState>
+
+        <EmptyState
+          align="start"
+          data-testid="split"
+          layout="split"
+          tone="accent"
+        >
+          <EmptyStateHeader align="start">
+            <EmptyStateEyebrow>Workspace</EmptyStateEyebrow>
+            <EmptyStateTitle>Invite the first operator</EmptyStateTitle>
+          </EmptyStateHeader>
+          <EmptyStateMedia size="hero">42</EmptyStateMedia>
+          <EmptyStateActions layout="inline">
+            <Button size="sm">Invite operator</Button>
+          </EmptyStateActions>
+        </EmptyState>
+      </>
+    );
+
+    expect(screen.getByTestId("compact")).toHaveAttribute("data-layout", "compact");
+    expect(screen.getByTestId("compact")).toHaveAttribute("data-align", "start");
+    expect(screen.getByText("Q1")).toHaveAttribute("data-size", "compact");
+    expect(
+      screen.getByRole("button", { name: "Create task" }).closest('[data-slot="actions"]')
+    ).toHaveAttribute("data-layout", "stack");
+
+    expect(screen.getByTestId("split")).toHaveAttribute("data-layout", "split");
+    expect(screen.getByText("Workspace")).toHaveAttribute("data-slot", "eyebrow");
+    expect(screen.getByText("42")).toHaveAttribute("data-size", "hero");
+  });
 });

packages/ui/src/components/empty-state.tsx

@@ -17,44 +17,48 @@ export type EmptyStateProps = ComponentPropsWithoutRef<"div"> &
   VariantProps<typeof emptyStateVariants>;
 
 export const EmptyState = forwardRef<HTMLDivElement, EmptyStateProps>(function EmptyState(
-  { className, tone, ...props },
+  { align, className, layout, tone, ...props },
   ref
 ) {
   return (
     <div
       {...props}
       {...createSlot("root")}
-      {...createDataAttributes({ tone })}
+      {...createDataAttributes({ align, layout, tone })}
-      className={cn(emptyStateVariants({ tone }), className)}
+      className={cn(emptyStateVariants({ align, layout, tone }), className)}
       ref={ref}
     />
   );
 });
 
-export type EmptyStateMediaProps = ComponentPropsWithoutRef<"div">;
+export type EmptyStateMediaProps = ComponentPropsWithoutRef<"div"> &
+  VariantProps<typeof emptyStateMediaVariants>;
 
 export const EmptyStateMedia = forwardRef<HTMLDivElement, EmptyStateMediaProps>(
-  function EmptyStateMedia({ className, ...props }, ref) {
+  function EmptyStateMedia({ className, size, ...props }, ref) {
     return (
       <div
         {...props}
         {...createSlot("media")}
-        className={cn(emptyStateMediaVariants(), className)}
+        {...createDataAttributes({ size })}
+        className={cn(emptyStateMediaVariants({ size }), className)}
         ref={ref}
       />
     );
   }
 );
 
-export type EmptyStateHeaderProps = ComponentPropsWithoutRef<"div">;
+export type EmptyStateHeaderProps = ComponentPropsWithoutRef<"div"> &
+  VariantProps<typeof emptyStateHeaderVariants>;
 
 export const EmptyStateHeader = forwardRef<HTMLDivElement, EmptyStateHeaderProps>(
-  function EmptyStateHeader({ className, ...props }, ref) {
+  function EmptyStateHeader({ align, className, ...props }, ref) {
     return (
       <div
         {...props}
         {...createSlot("header")}
-        className={cn(emptyStateHeaderVariants(), className)}
+        {...createDataAttributes({ align })}
+        className={cn(emptyStateHeaderVariants({ align }), className)}
         ref={ref}
       />
     );
@@ -107,15 +111,17 @@ export const EmptyStateDescription = forwardRef<
   );
 });
 
-export type EmptyStateActionsProps = ComponentPropsWithoutRef<"div">;
+export type EmptyStateActionsProps = ComponentPropsWithoutRef<"div"> &
+  VariantProps<typeof emptyStateActionsVariants>;
 
 export const EmptyStateActions = forwardRef<HTMLDivElement, EmptyStateActionsProps>(
-  function EmptyStateActions({ className, ...props }, ref) {
+  function EmptyStateActions({ className, layout, ...props }, ref) {
     return (
       <div
         {...props}
         {...createSlot("actions")}
-        className={cn(emptyStateActionsVariants(), className)}
+        {...createDataAttributes({ layout })}
+        className={cn(emptyStateActionsVariants({ layout }), className)}
         ref={ref}
       />
     );

packages/ui/src/components/empty-state.variants.ts

@@ -3,8 +3,8 @@ import { getMotionRecipeClassNames } from "../lib/motion";
 
 export const emptyStateVariants = cva(
   [
-    "grid gap-6 rounded-[var(--ui-card-radius)] border p-8 shadow-[var(--ui-card-default-shadow)] sm:p-10 [border-width:var(--ui-card-border-width)]",
+    "grid gap-6 rounded-[var(--ui-card-radius)] border shadow-[var(--ui-card-default-shadow)] [border-width:var(--ui-card-border-width)]",
-    "justify-items-center text-center text-[var(--color-card-foreground)]",
+    "text-[var(--color-card-foreground)]",
     getMotionRecipeClassNames("transition", "ring")
   ],
   {
@@ -15,23 +15,58 @@ export const emptyStateVariants = cva(
           "border-[var(--ui-card-subtle-border)] bg-[var(--ui-card-subtle-bg)] shadow-[var(--ui-card-subtle-shadow)]",
         accent:
           "border-[var(--ui-card-accent-border)] bg-[var(--ui-card-accent-bg)] shadow-[var(--ui-card-accent-shadow)]"
+      },
+      layout: {
+        default: "p-8 sm:p-10",
+        compact:
+          "gap-4 p-6 sm:grid-cols-[auto_minmax(0,1fr)] sm:items-center sm:[&>[data-slot=media]]:row-span-2 sm:[&>[data-slot=header]]:justify-items-start sm:[&>[data-slot=actions]]:col-start-2 sm:[&>[data-slot=actions]]:justify-start",
+        split:
+          "p-6 sm:p-8 lg:grid-cols-[minmax(0,1fr)_auto] lg:items-center lg:[&>[data-slot=media]]:col-start-2 lg:[&>[data-slot=media]]:row-span-2 lg:[&>[data-slot=media]]:justify-self-end lg:[&>[data-slot=header]]:col-start-1 lg:[&>[data-slot=actions]]:col-start-1 lg:[&>[data-slot=actions]]:justify-start"
+      },
+      align: {
+        center: "justify-items-center text-center",
+        start: "justify-items-start text-left"
       }
     },
     defaultVariants: {
-      tone: "default"
+      tone: "default",
+      layout: "default",
+      align: "center"
     }
   }
 );
 
 export const emptyStateMediaVariants = cva(
   [
-    "grid min-h-20 min-w-20 place-items-center rounded-[var(--ui-card-radius)] border p-4 [border-width:var(--ui-card-border-width)]",
+    "grid place-items-center rounded-[var(--ui-card-radius)] border [border-width:var(--ui-card-border-width)]",
     "border-[var(--ui-card-subtle-border)] bg-[linear-gradient(180deg,color-mix(in_oklch,var(--color-background)_72%,white_28%),var(--ui-card-subtle-bg))]",
     "text-[var(--color-foreground)] shadow-[var(--ui-card-subtle-shadow)]"
-  ]
+  ],
+  {
+    variants: {
+      size: {
+        compact: "min-h-16 min-w-16 p-3",
+        default: "min-h-20 min-w-20 p-4",
+        hero: "min-h-28 min-w-28 p-6"
+      }
+    },
+    defaultVariants: {
+      size: "default"
+    }
+  }
 );
 
-export const emptyStateHeaderVariants = cva("grid max-w-[34rem] gap-2 justify-items-center");
+export const emptyStateHeaderVariants = cva("grid max-w-[34rem] gap-2", {
+  variants: {
+    align: {
+      center: "justify-items-center text-center",
+      start: "justify-items-start text-left"
+    }
+  },
+  defaultVariants: {
+    align: "center"
+  }
+});
 
 export const emptyStateEyebrowVariants = cva(
   "text-xs font-medium uppercase tracking-[var(--tracking-caps)] text-[var(--color-muted-foreground)]"
@@ -45,6 +80,14 @@ export const emptyStateDescriptionVariants = cva(
   "max-w-[30rem] text-sm leading-6 text-[var(--color-muted-foreground)]"
 );
 
-export const emptyStateActionsVariants = cva(
+export const emptyStateActionsVariants = cva("flex flex-wrap items-center gap-3", {
-  "flex flex-wrap items-center justify-center gap-3"
+  variants: {
-);
+    layout: {
+      inline: "justify-center",
+      stack: "flex-col justify-start sm:flex-row"
+    }
+  },
+  defaultVariants: {
+    layout: "inline"
+  }
+});

packages/ui/src/components/popover.test.tsx

@@ -40,6 +40,28 @@ describe("Popover", () => {
     });
   });
 
+  it("supports panel-style composition with explicit padding variants", async () => {
+    const user = userEvent.setup();
+
+    render(
+      <Popover>
+        <PopoverTrigger>Open inspector</PopoverTrigger>
+        <PopoverContent padding="none" size="xl">
+          <div>Inspector header</div>
+          <PopoverArrow />
+        </PopoverContent>
+      </Popover>
+    );
+
+    await user.click(screen.getByRole("button", { name: "Open inspector" }));
+
+    const header = await screen.findByText("Inspector header");
+    const content = header.closest('[data-slot="content"]');
+
+    expect(content).toHaveAttribute("data-padding", "none");
+    expect(content).toHaveAttribute("data-size", "xl");
+  });
+
   it("reports controlled open changes from the trigger", async () => {
     const user = userEvent.setup();
     const onOpenChange = vi.fn();

packages/ui/src/components/popover.tsx

@@ -19,7 +19,7 @@ export const PopoverContent = forwardRef<
   ElementRef<typeof PopoverPrimitive.Content>,
   PopoverContentProps
 >(function PopoverContent(
-  { className, sideOffset = 10, size, ...props },
+  { className, padding, sideOffset = 10, size, ...props },
   ref
 ) {
   return (
@@ -27,8 +27,8 @@ export const PopoverContent = forwardRef<
       <PopoverPrimitive.Content
         {...props}
         {...createSlot("content")}
-        {...createDataAttributes({ size })}
+        {...createDataAttributes({ padding, size })}
-        className={cn(popoverContentVariants({ size }), className)}
+        className={cn(popoverContentVariants({ padding, size }), className)}
         ref={ref}
         sideOffset={sideOffset}
       />
@@ -44,7 +44,7 @@ export const PopoverArrow = forwardRef<
     <PopoverPrimitive.Arrow
       {...props}
       {...createSlot("arrow")}
-      className={cn("fill-[var(--color-card)]", className)}
+      className={cn("fill-[var(--ui-panel-bg)]", className)}
       ref={ref}
     />
   );

packages/ui/src/components/popover.variants.ts

@@ -9,13 +9,21 @@ export const popoverContentVariants = cva(
   ],
   {
     variants: {
+      padding: {
+        none: "p-0",
+        sm: "p-3",
+        md: "p-4",
+        lg: "p-5"
+      },
       size: {
         sm: "w-64",
         md: "w-80",
-        lg: "w-[24rem]"
+        lg: "w-[24rem]",
+        xl: "w-[30rem]"
       }
     },
     defaultVariants: {
+      padding: "md",
       size: "md"
     }
   }

packages/ui/src/lib/icons.tsx

@@ -131,3 +131,24 @@ export function SortUnsortedIcon({ className, ...props }: IconProps) {
     </IconFrame>
   );
 }
+
+export function SpinnerIcon({ className, ...props }: IconProps) {
+  return (
+    <IconFrame className={className} {...props}>
+      <circle
+        cx="8"
+        cy="8"
+        opacity="0.22"
+        r="5.25"
+        stroke="currentColor"
+        strokeWidth="1.75"
+      />
+      <path
+        d="M8 2.75A5.25 5.25 0 0 1 13.25 8"
+        stroke="currentColor"
+        strokeLinecap="round"
+        strokeWidth="1.75"
+      />
+    </IconFrame>
+  );
+}

registry/index.json

@@ -287,6 +287,9 @@
         "packages/ui/src/components/checkbox.variants.ts",
         "packages/ui/src/components/data-table.tsx",
         "packages/ui/src/components/data-table.variants.ts",
+        "packages/ui/src/components/dialog.variants.ts",
+        "packages/ui/src/components/dropdown-menu.tsx",
+        "packages/ui/src/components/dropdown-menu.variants.ts",
         "packages/ui/src/components/empty-state.tsx",
         "packages/ui/src/components/empty-state.variants.ts",
         "packages/ui/src/components/field.tsx",
@@ -295,6 +298,8 @@
         "packages/ui/src/components/label.tsx",
         "packages/ui/src/components/select.tsx",
         "packages/ui/src/components/select.variants.ts",
+        "packages/ui/src/components/sheet.tsx",
+        "packages/ui/src/components/sheet.variants.ts",
         "packages/ui/src/components/skeleton.tsx",
         "packages/ui/src/components/spinner.tsx",
         "packages/ui/src/lib/cn.ts",
@@ -307,6 +312,8 @@
       "name": "data-table",
       "packageDependencies": {
         "@radix-ui/react-checkbox": "^1.3.3",
+        "@radix-ui/react-dialog": "^1.1.15",
+        "@radix-ui/react-dropdown-menu": "^2.1.16",
         "@radix-ui/react-select": "^2.2.6",
         "@radix-ui/react-slot": "^1.2.4",
         "@tanstack/react-table": "^8.21.3",