fix(android): drop geolocator for a native LocationManager channel

Removes the geolocator dependency, which transitively embedded
com.google.android.gms.* (play-services-location) — proprietary classes
that F-Droid's scanner rejects. The optional coarse-location button now
talks to Android's own LocationManager over a small platform channel
(org.comunes.tane/coarse_location): permission prompt, single coarse fix
with a 12s timeout, last-known fallback, null on any failure. Behavior
is unchanged and the CoarseLocationProvider interface is preserved, so
the UI, i18n and widget tests need no changes.

Also sets dependenciesInfo.includeInApk/Bundle = false so the AGP
dependency-metadata block (also flagged by F-Droid) is not embedded.
Neither change affects the Google Play build.

apps/app_seeds/pubspec.yaml

@@ -1,7 +1,7 @@
 name: tane
 description: "Tane — local-first, encrypted, decentralized traditional-seed inventory and market."
 publish_to: 'none'
-version: 0.1.0+2
+version: 0.1.1+3
 
 environment:
   sdk: ^3.11.5
@@ -67,10 +67,10 @@ dependencies:
   material_symbols_icons: ^4.2951.0
   url_launcher: ^6.3.2
   package_info_plus: ^9.0.1
-  # Optional coarse device location (BSD-3) to set the sharing area without
-  # typing a code. Low accuracy only; the value is immediately reduced to a
-  # low-precision geohash. Behind an interface so it's fakeable and pluggable.
-  geolocator: ^13.0.1
+  # Optional coarse device location goes through a small platform channel to
+  # Android's own LocationManager (lib/services/coarse_location.dart) — no
+  # location plugin, and deliberately no Google Play Services, so the APK
+  # stays free of proprietary classes (F-Droid).
   # Network reachability (BSD-3) to show a global "you're offline" banner — the
   # social layer needs a connection; the inventory works regardless.
   connectivity_plus: ^6.1.0