feat: implement PWA scaffold, dark design system, and 3-tab glassmorphism nav

- Add @serwist/next for PWA service worker (precaching, offline support)
- Create public/manifest.json with dark theme (#0a0a0f) and SVG icons
- Rewrite globals.css with full dark premium design system (Tailwind v4)
  - Design tokens: bg-deep, bg-card, gold, nur-purple, emerald, borders, text
  - Utility classes: .glass, .glass-light, .gold-gradient, .nur-gradient, .gold-purple-gradient
  - Prayer ring SVG styles
- Replace old 5-tab nav with 3-tab floating glassmorphism pill
  - Home (House), Nur center raised 56px gold-purple circle, Profile (User)
  - Active gold #D4AF37, inactive #666, safe-area-aware
- Create src/lib/api/wordpress.ts fetchAPI wrapper with JWT auth
- Update layout.tsx with manifest, apple-web-app, Viewport export

package.json

@@ -10,6 +10,8 @@
   },
   "dependencies": {
     "@prisma/client": "^5.22.0",
+    "@serwist/cli": "^9.5.11",
+    "@serwist/next": "^9.5.11",
     "@types/bcryptjs": "^2.4.6",
     "@types/leaflet": "^1.9.14",
     "bcryptjs": "^3.0.3",
@@ -21,6 +23,7 @@
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "react-leaflet": "^5.0.0",
+    "serwist": "^9.5.11",
     "stripe": "^17.0.0"
   },
   "devDependencies": {