fix(gps,data): official-code fixes - real GPS result callback, no fake update success (4.5.2, release pending)

Official code issues found during review (user-reported):
1. GPS "success" was shown instantly even when no fix was obtained:
   - setStationPosition() always returned true (permissions exception
     swallowed, async requestLocationUpdates without waiting)
   - now: suspend + LocationManagerCompat.getCurrentLocation (GPS
     first, network fallback), permission check upfront, 15s timeout,
     success only when onLocationChanged fires; SettingsRepo takes
     Context for the permission check; ViewModel waits for the real
     result and shows "Unable to get location - check permission and
     GPS/network signal" on failure (4 locales)
2. Data update faked success on total failure:
   - updateFromRemote now counts successful sources; 0 success throws
     IOException -> timestamp NOT refreshed, Toast "Update failed -
     check your network" (4 locales, new IShowToast resId overload)
   - OkHttp timeouts widened: connect 15s / read 20s / write 20s

Verified: check_strings OK; all modules compile.
Release intentionally NOT triggered (user: fix everything first, then
one release).

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsViewModel.kt

@@ -164,7 +164,16 @@ class SettingsViewModel(
     // region Position helpers — consolidated from 3 near-identical functions
 
     private fun setGpsPosition() {
-        updatePosition(R.string.prefs_loc_gps_error) { settingsRepo.setStationPosition() }
+        viewModelScope.launch {
+            _uiState.update { it.copy(positionSettings = it.positionSettings.copy(isUpdating = true)) }
+            val success = settingsRepo.setStationPosition()
+            _uiState.update {
+                it.copy(positionSettings = it.positionSettings.copy(
+                    isUpdating = false,
+                    messageResId = if (success) R.string.prefs_loc_success else R.string.prefs_loc_gps_error
+                ))
+            }
+        }
     }
 
     private fun setGeoPosition(latitude: Double, longitude: Double) {
@@ -212,6 +221,7 @@ class SettingsViewModel(
                 it.copy(dataSettings = it.dataSettings.copy(isUpdating = false))
             }
             println(exception)
+            showToast(R.string.prefs_data_update_failed)
         }
     }