feat(web): add customer portal with 7 sections and staff impersonation

Implements the customer-facing portal for pet parents with:
- Dashboard showing upcoming appointments, pet cards, loyalty rewards
- Multi-step appointment booking flow with recurring scheduling
- Pet profiles with medical/behavioral notes and vaccination tracking
- Grooming report cards with before/after, behavior assessment, sharing
- Billing & payments with invoices, saved methods, autopay, tips, packages
- Communication with chat-style messaging and notification preferences
- Account settings with personal info, password, pet management, agreements
- Staff impersonation mode with required reason, 30-min session timer,
  non-dismissable banner, viewport border, watermark, read-only enforcement,
  and full audit trail viewer

Also adds Tailwind CSS, lucide-react, and recharts as dependencies.

Closes #53

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/package.json

@@ -13,9 +13,13 @@
   },
   "dependencies": {
     "@groombook/types": "workspace:*",
+    "@tailwindcss/vite": "^4.2.2",
+    "lucide-react": "^0.577.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
-    "react-router-dom": "^7.1.2"
+    "react-router-dom": "^7.1.2",
+    "recharts": "^3.8.0",
+    "tailwindcss": "^4.2.2"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^6.9.1",