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>

README.md

@@ -35,7 +35,7 @@ bigbrainparking/
 | --- | --- | --- |
 | Phone + password login | ✅ wired | tokens in OS keystore |
 | Map of nearby meters (clickable, zoom, live GPS) | ✅ wired | MapLibre + OpenFreeMap tiles (no key) |
-| "Near my last location" proximity search | ✅ wired | caches last GPS fix |
+| Last-lot + My-location search | ✅ wired | opens on your last session's lot; GPS sent only via explicit "My location" |
 | QR kiosk scan → meter lookup | ✅ wired | on-device VisionCamera |
 | Save / share kiosks | ✅ wired | local (no server favorites API exists) |
 | Active / past sessions | ✅ wired | list views + tap for full receipt |