Add order management UI

Rebuild the landing page as an order overview for the Speisekarte24 tool:

- Two tabs: all orders and "Nicht übermittelt", the latter fed by the
  15-minute rule and highlighted while it holds entries
- Table, list and grid views behind an icon dropdown, plus search,
  filters, sorting and pagination
- Escalation timeline (three transmissions, tag, voice message, direct
  call, SOS) rendered in the detail dialog, inline in the list view and
  condensed to the current step in the table
- Action definitions live in one module and feed the row menu, the
  detail dialog and the card quick-action bar

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

package.json

@@ -9,9 +9,18 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "@base-ui/react": "^1.7.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^1.28.0",
     "next": "16.3.0",
+    "next-themes": "^0.4.6",
     "react": "19.2.8",
-    "react-dom": "19.2.8"
+    "react-dom": "19.2.8",
+    "shadcn": "^4.16.1",
+    "sonner": "^2.0.7",
+    "tailwind-merge": "^3.6.0",
+    "tw-animate-css": "^1.4.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",