Retire the classic flight screen and stop the start-up location grant being dropped

MainActivity now makes the app's only start-up permission request and tells
Dart when it finishes; the phone-location stream waits for that instead of
asking in parallel, which made Android drop the location grant.

The P3 simulator run passed, so the pre-P2 FlightControlPage, the pages only
it used and its Settings toggle are gone. The app smoke test checks the home
screen again instead of the login gate removed in July.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Fly App/android/app/src/main/kotlin/com/pilotvault/flyapp/DjiSdkBridge.kt

@@ -198,6 +198,15 @@ class DjiSdkBridge(
         mainHandler.post { eventSink?.success(event) }
     }
 
+    /**
+     * MainActivity's start-up permission request finished. Dart must not ask for
+     * location itself while that dialog is up (Android allows one request at a
+     * time and drops the other's grant), so it waits for this event instead.
+     */
+    fun onPermissionsResult(locationGranted: Boolean) {
+        emit(mapOf("type" to "permissions", "location" to locationGranted))
+    }
+
     // ── DJI SDK registration & product lifecycle ─────────────────────────────────
 
     private fun registerApp() {

Fly App/android/app/src/main/kotlin/com/pilotvault/flyapp/MainActivity.kt

@@ -31,7 +31,9 @@ class MainActivity : FlutterFragmentActivity() {
     /**
      * The DJI SDK needs these dangerous permissions granted before it can connect
      * to / communicate with a product. We request them up front from the host
-     * Activity so the Flutter UI can stay focused on the SDK flow.
+     * Activity so the Flutter UI can stay focused on the SDK flow. This is the
+     * app's only start-up permission request: Dart waits for the result (see
+     * [DjiSdkBridge.onPermissionsResult]) rather than asking in parallel.
      */
     private fun requestDjiPermissions() {
         val missing = REQUIRED_PERMISSIONS.filter {
@@ -42,6 +44,17 @@ class MainActivity : FlutterFragmentActivity() {
         }
     }
 
+    @Deprecated("Deprecated in Java")
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        if (requestCode != PERMISSION_REQUEST_CODE) return
+        val location = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) ==
+            PackageManager.PERMISSION_GRANTED ||
+            ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) ==
+            PackageManager.PERMISSION_GRANTED
+        bridge?.onPermissionsResult(location)
+    }
+
     companion object {
         private const val PERMISSION_REQUEST_CODE = 12321