feat: 行程卡片间显示交通路线描述和时间

- get_travel_time 解析 Amap segments 提取线路名和站数
- PlanItem 新增 transitToNext / transitDescription 字段
- finalize_plan schema 加入 transit_to_next_description
- 修复 Turbopack 中文引号解析报错
- UI 连接器改为两行布局，路线描述与时长分行显示

src/components/BlindboxPlan.tsx

@@ -469,6 +469,20 @@ export default function BlindboxPlan({
                         setDraft({ ...item });
                       }}
                     />
+                    {/* Transit connector to next activity */}
+                    {item.transitToNext != null && i < currentDay.items.length - 1 && (
+                      <div className="flex items-start gap-1.5 py-2 pl-1">
+                        <Navigation size={9} className="mt-0.5 shrink-0 text-purple-400/40" />
+                        <div className="flex flex-col gap-0.5">
+                          {item.transitDescription && (
+                            <span className="text-[10px] leading-snug text-dim">
+                              {item.transitDescription}
+                            </span>
+                          )}
+                          <span className="text-[10px] text-dim/70">约 {item.transitToNext} 分钟</span>
+                        </div>
+                      </div>
+                    )}
                   </motion.div>
                 ))}
               </SortableContext>

src/lib/ai.ts

@@ -53,12 +53,15 @@ const SCHEDULE_SYSTEM_PROMPT = `你是一个周末行程规划师。根据用户
       "lat": 31.2,
       "lng": 121.5,
       "duration": 120,
-      "reason": "选择这个时间和地点的简短理由"
+      "reason": "选择这个时间和地点的简短理由",
+      "transitToNext": 20,
+      "transitDescription": "地铁2号线(6站) → 地铁9号线(3站)"
     }
   ],
   "summary": "一句话总结这个行程的亮点"
 }
 
+transitToNext 为从本活动结束到下一活动的预计交通时间（分钟），根据两点地理距离估算；transitDescription 为交通方式描述（如"地铁X号线"、"公交XXX路"、"步行"）；最后一项不填这两个字段。
 按时间顺序排列。只返回 JSON。`;
 
 export interface ScheduleContext {
@@ -222,6 +225,14 @@ ${Object.entries(ctx.candidates)
         lng: Number(item.lng) || 0,
         duration: Number(item.duration) || 60,
         reason: String(item.reason ?? ""),
+        ...(item.transitToNext != null && Number(item.transitToNext) > 0
+          ? {
+              transitToNext: Math.round(Number(item.transitToNext)),
+              ...(item.transitDescription
+                ? { transitDescription: String(item.transitDescription) }
+                : {}),
+            }
+          : {}),
       })),
       summary: String(parsed.summary ?? ""),
     };

src/lib/blindboxPlanGen.ts

@@ -110,6 +110,34 @@ function selectIdeasForSlots(ideas: TaggedIdea[], availableHours: number): Tagge
   return selected;
 }
 
+// ---------------------------------------------------------------------------
+// Transit segment parser
+// ---------------------------------------------------------------------------
+
+function parseTransitSegments(
+  segments: Record<string, unknown>[],
+): { description: string; mode: string } {
+  const parts: string[] = [];
+  let hasSubway = false;
+  let hasBus = false;
+
+  for (const seg of segments) {
+    const bus = seg.bus as { buslines?: Record<string, unknown>[] } | undefined;
+    if (!bus?.buslines?.length) continue;
+    for (const line of bus.buslines) {
+      const name = String(line.name ?? "");
+      const viaNum = Number(line.via_num ?? 0);
+      const isSubway = String(line.type ?? "").includes("地铁") || String(line.type ?? "").includes("轨道");
+      if (isSubway) hasSubway = true; else hasBus = true;
+      parts.push(viaNum > 0 ? `${name}(${viaNum}站)` : name);
+    }
+  }
+
+  const mode = hasSubway ? "地铁" : hasBus ? "公交" : "步行";
+  const description = parts.length > 0 ? parts.join(" → ") : mode;
+  return { description, mode };
+}
+
 // ---------------------------------------------------------------------------
 // POI search (shared by both paths)
 // ---------------------------------------------------------------------------
@@ -205,7 +233,7 @@ const AGENT_SYSTEM_PROMPT = `你是一个周末行程规划 Agent。你有以下
 4. 如果搜索结果不理想（0结果或不相关），尝试换关键词重搜
 5. 用 get_travel_time 检查关键路段的公共交通时间，如果某段超过 45 分钟考虑换更近的地点
 6. 综合地理位置、时间安排、活动特点，规划最优路线
-7. 确认无误后 finalize_plan 提交
+7. 确认无误后 finalize_plan 提交，每个活动填写 transit_to_next_minutes 和 transit_to_next_description（直接复制 get_travel_time 返回的 durationMin 和 description，最后一项不填）
 
 规划原则：
 - 地理位置相近，最小化移动距离
@@ -229,6 +257,8 @@ interface FinalizePlanDay {
     lng: number;
     duration: number;
     reason: string;
+    transit_to_next_minutes?: number;
+    transit_to_next_description?: string;
   }[];
   summary: string;
 }
@@ -333,10 +363,10 @@ function buildAgentTools(
           return JSON.stringify({ error: "未找到公交路线" });
         }
         const transit = data.route.transits[0];
-        return JSON.stringify({
+        const durationMin = Math.ceil(Number(transit.duration) / 60);
-          distanceKm: Math.round(Number(data.route.distance) / 100) / 10,
+        const distanceKm = Math.round(Number(data.route.distance) / 100) / 10;
-          durationMin: Math.ceil(Number(transit.duration) / 60),
+        const { description, mode } = parseTransitSegments(transit.segments ?? []);
-        });
+        return JSON.stringify({ durationMin, distanceKm, description, mode });
       } catch {
         return JSON.stringify({ error: "路线查询失败" });
       }
@@ -345,7 +375,7 @@ function buildAgentTools(
     progressAfter: (_args, result) => {
       const r = JSON.parse(result);
       if (r.error) return `路线查询失败`;
-      return `公共交通约 ${r.durationMin} 分钟（${r.distanceKm}km）`;
+      return `${r.description} 约 ${r.durationMin} 分钟（${r.distanceKm}km）`;
     },
   };
 
@@ -374,6 +404,14 @@ function buildAgentTools(
                     lng: { type: "number" },
                     duration: { type: "number", description: "时长（分钟）" },
                     reason: { type: "string", description: "选择理由" },
+                    transit_to_next_minutes: {
+                      type: "number",
+                      description: "从本活动结束后到下一活动的预计交通时间（分钟）。最后一个活动不填",
+                    },
+                    transit_to_next_description: {
+                      type: "string",
+                      description: "到下一活动的交通方式描述，直接使用 get_travel_time 返回的 description 字段值，例如：地铁2号线(6站) → 地铁9号线(3站)。最后一个活动不填",
+                    },
                   },
                   required: ["time", "activity", "poi", "address", "lat", "lng", "duration", "reason"],
                 },
@@ -440,6 +478,14 @@ async function runAgentPlanGeneration(
           lng: Number(item.lng) || 0,
           duration: Number(item.duration) || 60,
           reason: String(item.reason ?? ""),
+          ...(item.transit_to_next_minutes != null && Number(item.transit_to_next_minutes) > 0
+            ? {
+                transitToNext: Math.round(Number(item.transit_to_next_minutes)),
+                ...(item.transit_to_next_description
+                  ? { transitDescription: String(item.transit_to_next_description) }
+                  : {}),
+              }
+            : {}),
         }))
       : [],
     summary: String(day.summary ?? ""),

src/types/index.ts

@@ -113,6 +113,10 @@ export interface PlanItem {
   lng: number;
   duration: number;
   reason: string;
+  /** 到下一个活动的估计交通时间（分钟），最后一项无此字段 */
+  transitToNext?: number;
+  /** 到下一个活动的交通方式描述，如"地铁2号线→9号线" */
+  transitDescription?: string;
 }
 
 export interface WeekendPlanData {