feat: refactor monolithic App.vue into modular Vue component architecture

- Extract 711-line App.vue into 15+ focused files across 5 directories
- Add data layer (icons, metrics, policies, auditTrail, requests)
- Add composables (useNavigation, useRequests, useChat, useToast)
- Add layout components (SidebarRail, TopBar, FilterBar)
- Add shared components (PanelHead, InfoRow, ToastNotification)
- Add business component (RequestTable) and 5 view components
- Extract global CSS to assets/styles/global.css
- Add start.sh with WSL/Windows cross-platform support
- Add .gitignore for node_modules, dist, and IDE dirs

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "x-financial-reimbursement-admin",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "start": "vite --host 127.0.0.1",
+    "dev": "vite --host 127.0.0.1",
+    "build": "vite build",
+    "preview": "vite preview --host 127.0.0.1"
+  },
+  "dependencies": {
+    "@vitejs/plugin-vue": "^5.2.4",
+    "@vueuse/motion": "^3.0.3",
+    "vite": "^5.4.19",
+    "vue": "^3.5.13"
+  }
+}