🔖 release(v0.1.4): bump version and UI optimizations

- Remove unused version display logic and update summary
- Add silent audio playback to prevent browser tab throttling
- Update CourseWorkspace and Setting components
- Bump version from 0.1.3 to 0.1.4

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "0.1.3",
+  "version": "0.1.4",
   "type": "module",
   "scripts": {
     "dev": "vite",