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/android/app/build.gradle.kts

@@ -56,6 +56,13 @@ android {
         }
     }
 
+    dependenciesInfo {
+        // No Google-encrypted dependency-metadata block in the APK/AAB
+        // signature: F-Droid rejects it, and Play does not require it.
+        includeInApk = false
+        includeInBundle = false
+    }
+
     buildTypes {
         release {
             // Sign with the real release keystore when key.properties is present,