Phase 2: Core transcription pipeline and audio playback

- Implement faster-whisper TranscribeService with word-level timestamps,
  progress reporting, and hardware auto-detection
- Wire up Rust SidecarManager for Python process lifecycle (spawn, IPC, shutdown)
- Add transcribe_file Tauri command bridging frontend to Python sidecar
- Integrate wavesurfer.js WaveformPlayer with play/pause, skip, seek controls
- Build TranscriptEditor with word-level click-to-seek and active highlighting
- Connect file import flow: prompt → asset load → transcribe → display
- Add typed tauri-bridge service with TranscriptionResult interface
- Add Python tests for hardware detection and transcription result formatting

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -16,7 +16,11 @@
   "license": "MIT",
   "dependencies": {
     "@tauri-apps/api": "^2",
-    "@tauri-apps/plugin-opener": "^2"
+    "@tauri-apps/plugin-opener": "^2",
+    "@tiptap/core": "^3.20.0",
+    "@tiptap/pm": "^3.20.0",
+    "@tiptap/starter-kit": "^3.20.0",
+    "wavesurfer.js": "^7.12.1"
   },
   "devDependencies": {
     "@sveltejs/adapter-static": "^3.0.6",