Vendor media_kit_video 2.0.1 with the X11/EGL fix (hardware rendering on X11 with Flutter >= 3.38)

Flutter >= 3.38 keeps its EGL contexts on the raster thread, so
media_kit's video output found none on the platform thread and fell
back to software rendering (no shaders, ~5 fps) on X11. The patched
output opens Flutter's EGL display itself, steps GDK's GLX context aside
on X11 and releases its own context. Patch from a friend's agent, kept
in third_party/media_kit_video/starsync/. Wayland/NVIDIA still renders
on the GPU (checked); the X11 path was verified on the friend's machine.

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

apps/desktop/pubspec.lock

@@ -538,10 +538,9 @@ packages:
   media_kit_video:
     dependency: "direct main"
     description:
-      name: media_kit_video
-      sha256: afaa509e7b7e0bf247557a3a740cde903a52c34ace9810f94500e127bd7b043d
-      url: "https://pub.dev"
-    source: hosted
+      path: "../../third_party/media_kit_video"
+      relative: true
+    source: path
     version: "2.0.1"
   meta:
     dependency: transitive

apps/desktop/pubspec.yaml

@@ -10,7 +10,9 @@ dependencies:
     sdk: flutter
   signals: ^7.0.0
   media_kit: ^1.1.0
-  media_kit_video: ^2.0.1
+  # Vendored with Starsync's patches (third_party/media_kit_video/starsync).
+  media_kit_video:
+    path: ../../third_party/media_kit_video
   media_kit_libs_video: ^1.0.0
   path_provider: ^2.1.0
   web_socket_channel: ^3.0.0