v0.2.0: never auto-send GPS; "Last lot" uses last session; About page rework

Location privacy (hard invariant): the device GPS is sent to the API ONLY when
the user taps "My location" and searches.
- Map opens on your LAST session's parking lot (the meter's coordinate from
  history), not your GPS.
- "Last" -> "Last lot": centers on the last session's lot and searches there
  (~couple-mile view) — no GPS.
- "Search this area" falls back to the tracked viewport center, never the GPS fix.

About page: lead with a BigBrainParking open-source blurb + repo link (was showing
ParkSmarter's own About text first); privacy wording updated to match; drop the
now-unused getAbout fetch.

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

app/app.json

@@ -3,14 +3,14 @@
     "name": "BigBrainParking",
     "slug": "bigbrainparking",
     "scheme": "bigbrainparking",
-    "version": "0.1.9",
+    "version": "0.2.0",
     "orientation": "portrait",
     "userInterfaceStyle": "automatic",
     "newArchEnabled": true,
     "icon": "./assets/icon.png",
     "android": {
       "package": "top.mowden.bigbrainparking",
-      "versionCode": 9,
+      "versionCode": 10,
       "edgeToEdgeEnabled": true,
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",