feat(web): add error boundaries, loading skeletons, render fixes and tree-shaking

- Add error.tsx to all 13 route groups: admin, allocations, analytics, dashboard, estimates, notifications, projects, reports, resources, roles, staffing, timeline, vacations
- Add loading.tsx to 9 routes that were missing them: admin, analytics, dashboard, estimates, notifications, reports, roles, staffing, vacations
- ResourceDetail: wrap vacationStart in useMemo to stabilize query key, remove dead windowEnd variable
- node-renderer.ts: replace barrel import (import * as THREE) with named imports for tree-shaking
- next.config.ts: add framer-motion and @capakraken/shared to optimizePackageImports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/src/app/(app)/dashboard/loading.tsx

@@ -0,0 +1,10 @@
+export default function Loading() {
+  return (
+    <div className="p-6 space-y-4 animate-pulse">
+      <div className="h-8 bg-gray-200 dark:bg-gray-700 rounded w-1/4" />
+      <div className="h-4 bg-gray-200 dark:bg-gray-700 rounded w-full" />
+      <div className="h-4 bg-gray-200 dark:bg-gray-700 rounded w-3/4" />
+      <div className="h-4 bg-gray-200 dark:bg-gray-700 rounded w-5/6" />
+    </div>
+  );
+}