diff --git a/src/frontend/src/store.ts b/src/frontend/src/store.ts
index 6b59078..8c963e3 100644
--- a/src/frontend/src/store.ts
+++ b/src/frontend/src/store.ts
@@ -412,26 +412,44 @@ export const useStore = create<AppStore>((set, get) => ({
   // v2.6: 加载项目任务列表（含聚合统计）
   loadV2Tasks: async () => {
     const pid = get().selectedProjectId;
-    if (!pid) { set({ v2tasks: [] }); return; }
     set({ v2tasksLoading: true });
     try {
-      const res = await fetch(`/api/projects/${pid}/tasks`);
-      if (!res.ok) { set({ v2tasks: [], v2tasksLoading: false }); return; }
-      const data = await res.json();
-      const tasks = data.tasks || [];
-      // 批量获取每个任务的聚合字段
-      // TODO: 后端应提供 list?expand=summary 接口，避免 N+1
-      const enriched = await Promise.all(tasks.map(async (t: any) => {
-        try {
-          const r = await fetch(`/api/projects/${pid}/tasks/${t.id}`);
-          if (r.ok) {
-            const detail = await r.json();
-            return { ...t, ...detail };
-          }
-        } catch { /* skip */ }
-        return t;
-      }));
-      set({ v2tasks: enriched });
+      if (!pid) {
+        // 全部任务模式：聚合所有项目
+        const projRes = await fetch('/api/projects');
+        if (!projRes.ok) { set({ v2tasks: [], v2tasksLoading: false }); return; }
+        const projData = await projRes.json();
+        const allPids = Object.keys(projData.projects || {});
+        const allTasks: any[] = [];
+        for (const p of allPids) {
+          try {
+            const r = await fetch(`/api/projects/${p}/tasks`);
+            if (r.ok) {
+              const d = await r.json();
+              for (const t of (d.tasks || [])) {
+                allTasks.push({ ...t, _projectId: p, _projectName: (projData.projects[p] as any)?.name || p });
+              }
+            }
+          } catch { /* skip */ }
+        }
+        set({ v2tasks: allTasks });
+      } else {
+        const res = await fetch(`/api/projects/${pid}/tasks`);
+        if (!res.ok) { set({ v2tasks: [], v2tasksLoading: false }); return; }
+        const data = await res.json();
+        const tasks = data.tasks || [];
+        const enriched = await Promise.all(tasks.map(async (t: any) => {
+          try {
+            const r = await fetch(`/api/projects/${pid}/tasks/${t.id}`);
+            if (r.ok) {
+              const detail = await r.json();
+              return { ...t, ...detail };
+            }
+          } catch { /* skip */ }
+          return t;
+        }));
+        set({ v2tasks: enriched });
+      }
     } catch { /* silently fail */ }
     finally { set({ v2tasksLoading: false }); }
   },