feat: add 3D model viewer, HUD panel updates, and eskin-finger-sdk submodule

- Add ModelStage component for 3D model rendering
- Update CenterStage to integrate ModelStage viewer
- Expand HudPanel with new functionality
- Add HUD type definitions
- Add je-skin-model.glb 3D model asset
- Add eskin-finger-sdk as git submodule

.gitignore

@@ -25,6 +25,12 @@ vite.config.ts.timestamp-*
 /src-tauri/target/
 /src-tauri/target-codex-check*/
 /src-tauri/gen/schemas/
+/src-tauri/gen/android/app/build/
+/src-tauri/gen/android/buildSrc/build/
+/src-tauri/gen/android/.gradle/
+/src-tauri/gen/android/app/.gradle/
+/src-tauri/gen/android/buildSrc/.gradle/
+/src-tauri/gen/android/build/reports/
 
 /src-tauri/program.log*
 /src-tauri/recording_replay_debug_*.csv