feat: timeline UI overhaul with project/resource panel redesign, quick filters, and API improvements

Redesigned timeline project and resource panels with expanded detail views,
added quick filter toolbar, improved drag handling, and enhanced vacation/entitlement
router logic. Includes e2e test updates and minor API fixes.

Co-Authored-By: claude-flow <ruv@ruv.net>

packages/api/src/__tests__/project-router-planning-counts.test.ts

@@ -12,7 +12,7 @@ function createProtectedCaller(db: Record<string, unknown>) {
       expires: "2026-03-13T00:00:00.000Z",
     },
     db: db as never,
-    dbUser: null,
+    dbUser: { id: "user_1", systemRole: "ADMIN", permissionOverrides: null },
   });
 }