fix: load login background video from local asset instead of network URL

VideoPlayerController.networkUrl(Uri.parse('assets/login-bg.mp4')) silently
fails because 'assets/login-bg.mp4' is not a valid HTTP URL — the video
never initializes and the login screen shows a plain black background.

Fix: switch to VideoPlayerController.asset() and register the file in
pubspec.yaml. The MP4 is gitignored (22 MB) and kept local for builds.

.gitignore

@@ -50,3 +50,5 @@ web/assets/login-bg.mp4
 # Keystore files (signing keys)
 *.jks
 *.keystore
+# large binary assets — keep local only, not tracked in git
+assets/login-bg.mp4

lib/screens/login_screen.dart

@@ -47,9 +47,7 @@ class _LoginScreenState extends State<LoginScreen> {
   }
 
   Future<void> _initVideo() async {
-    _videoController = VideoPlayerController.networkUrl(
-      Uri.parse('assets/login-bg.mp4'),
-    );
+    _videoController = VideoPlayerController.asset('assets/login-bg.mp4');
     await _videoController.initialize();
     _videoController.setLooping(true);
     _videoController.setVolume(0);

pubspec.yaml

@@ -34,6 +34,7 @@ flutter:
   assets:
     - assets/images/
     - assets/icon/hand_stop.svg
+    - assets/login-bg.mp4
   fonts:
     - family: Gilroy
       fonts: