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>

apps/web/next.config.ts

@@ -11,6 +11,19 @@ const nextConfig: NextConfig = {
     "@planarchy/ui",
   ],
   typedRoutes: true,
+  async headers() {
+    return [
+      {
+        source: "/(.*)",
+        headers: [
+          { key: "X-Frame-Options", value: "DENY" },
+          { key: "X-Content-Type-Options", value: "nosniff" },
+          { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
+          { key: "Permissions-Policy", value: "camera=(), microphone=(), geolocation=()" },
+        ],
+      },
+    ];
+  },
   // Webpack config (used by `next build` and `next dev` without --turbo)
   webpack(config) {
     config.resolve.alias = {