feat(admin): implement navigation & layout (Plan 02, Phases 1–3)

Phase 1 — Active route highlighting
- NavMain derives isActive from usePathname() at render time
- Flat links: exact match; collapsible groups: startsWith; sub-items: exact match
- Removed hardcoded isActive fields from NAV_LINKS

Phase 2 — Dynamic breadcrumbs
- Added ROUTE_LABELS map to app.constants.ts
- Created DynamicBreadcrumb component (pathname-driven, ShadCN primitives)
- Wired DynamicBreadcrumb into dashboard layout header

Phase 3 — Mobile shell (observation only, no structural changes needed)

Icons — migrated all sidebar/breadcrumb icons from lucide-react to @hugeicons/react + @hugeicons/core-free-icons

Infra
- tsconfig.json: moduleResolution → bundler (required for hugeicons ESM exports)
- Renamed middleware.ts → proxy.ts (Next.js 15.5 convention)
- Added @hugeicons/mcp-server to .mcp.json

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

apps/admin/tsconfig.json

@@ -12,10 +12,10 @@
     "incremental": true,
     "module": "esnext",
     "esModuleInterop": true,
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "plugins": [
       {
         "name": "next"
@@ -23,14 +23,17 @@
     ],
     "target": "ES2017",
     "paths": {
-      "@/*": ["./src/*"]
+      "@/*": [
+        "./src/*"
+      ]
     }
   },
   "include": [
     "next-env.d.ts",
     ".next/types/**/*.ts",
     "**/*.ts",
-    "**/*.tsx"
+    "**/*.tsx",
+    ".next/dev/types/**/*.ts"
   ],
   "exclude": [
     "node_modules"