fix(ui): align gauge animation with validation

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

@@ -116,6 +116,10 @@ describe("Gauge", () => {
     const indicator = gauge.querySelector('[data-slot="indicator"]');
     const value = gauge.querySelector('[data-slot="value"]');
 
+    act(() => {
+      vi.advanceTimersByTime(16);
+    });
+
     expect(gauge).toHaveAttribute("data-animating", "");
     expect(indicator).toHaveAttribute("stroke-dasharray", "0 100");
     expect(value).toHaveTextContent("0%");

packages/ui/src/components/gauge.tsx

@@ -374,6 +374,7 @@ export const Gauge = forwardRef<HTMLDivElement, GaugeProps>(function Gauge(
   useEffect(() => {
     const targetPercentage = percentage ?? 0;
     const targetValue = computedAriaValueNow ?? null;
+    let frame = 0;
 
     if (
       disableMotion ||
@@ -383,17 +384,21 @@ export const Gauge = forwardRef<HTMLDivElement, GaugeProps>(function Gauge(
         previousPercentageRef.current === targetPercentage &&
         previousValueRef.current === targetValue)
     ) {
-      setDisplayPercentage(targetPercentage);
-      setDisplayValue(targetValue);
-      setIsAnimating(false);
-      previousPercentageRef.current = targetPercentage;
-      previousValueRef.current = targetValue;
+      frame = window.requestAnimationFrame(() => {
+        setDisplayPercentage(targetPercentage);
+        setDisplayValue(targetValue);
+        setIsAnimating(false);
+        previousPercentageRef.current = targetPercentage;
+        previousValueRef.current = targetValue;
 
-      if (targetValue != null) {
-        hasAnimatedRef.current = true;
-      }
+        if (targetValue != null) {
+          hasAnimatedRef.current = true;
+        }
+      });
 
-      return;
+      return () => {
+        window.cancelAnimationFrame(frame);
+      };
     }
 
     const fromPercentage = hasAnimatedRef.current ? previousPercentageRef.current : 0;
@@ -401,13 +406,8 @@ export const Gauge = forwardRef<HTMLDivElement, GaugeProps>(function Gauge(
       ? previousValueRef.current ?? resolvedMin
       : resolvedMin;
     const duration = hasAnimatedRef.current ? UPDATE_SWEEP_DURATION : INITIAL_SWEEP_DURATION;
-    let frame = 0;
     let startTime: number | null = null;
 
-    setDisplayPercentage(fromPercentage);
-    setDisplayValue(fromValue);
-    setIsAnimating(true);
-
     const tick = (timestamp: number) => {
       if (startTime == null) {
         startTime = timestamp;
@@ -416,6 +416,7 @@ export const Gauge = forwardRef<HTMLDivElement, GaugeProps>(function Gauge(
       const progress = Math.min((timestamp - startTime) / duration, 1);
       const easedProgress = easeOutCubic(progress);
 
+      setIsAnimating(progress < 1);
       setDisplayPercentage(fromPercentage + (targetPercentage - fromPercentage) * easedProgress);
       setDisplayValue(fromValue + (targetValue - fromValue) * easedProgress);
 

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

@@ -110,7 +110,7 @@ describe("Progress", () => {
     const { rerender } = render(<Progress aria-label="Reduced sync status" value={null} />);
 
     let progressbar = screen.getByRole("progressbar", { name: "Reduced sync status" });
-    let indicator = progressbar.querySelector('[data-slot="indicator"]');
+    const indicator = progressbar.querySelector('[data-slot="indicator"]');
 
     expect(progressbar).toHaveAttribute("data-reduced-motion", "");
     expect(indicator).toHaveAttribute("data-reduced-motion", "");