Add request logging mode, dark mode, Account hub, profile, vehicle CRUD, cards view

- Client: logRequests option + redacted request/response logging (setLogRequests to
  toggle at runtime); enabled via app extra.debugHttp for on-device 401 debugging
- Dark mode (persisted) via ThemeProvider + React Navigation theme
- New "Account" tab: Profile (view), Vehicles (full CRUD), Payment methods (view-only),
  About, dark-mode + request-logging toggles, sign out

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/app.json

@@ -44,7 +44,8 @@
     "extra": {
       "psEnvironment": "prodv2",
       "mapStyleUrl": "https://tiles.openfreemap.org/styles/liberty",
-      "unifiedPushDefaultDistributor": "io.heckel.ntfy"
+      "unifiedPushDefaultDistributor": "io.heckel.ntfy",
+      "debugHttp": true
     }
   }
 }