Fix app stability: graceful model switching and web server improvements

- Add comprehensive error handling to prevent crashes during model reload
- Implement automatic port fallback (8080-8084) for web server conflicts
- Configure uvicorn to work properly with PyInstaller console=False builds
- Add proper web server shutdown on app close to release ports
- Improve error reporting with full tracebacks for debugging

Fixes:
- App crashing when switching models
- Web server not starting after app crash (port conflict)
- Web server failing silently in compiled builds without console

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

server/web_display.py

@@ -223,11 +223,21 @@ class TranscriptionWebServer:
     async def start(self):
         """Start the web server."""
         import uvicorn
+        import logging
+
+        # Configure uvicorn to work without console (for PyInstaller builds)
+        # Suppress uvicorn's default console logging
+        logging.getLogger("uvicorn").setLevel(logging.ERROR)
+        logging.getLogger("uvicorn.access").setLevel(logging.ERROR)
+        logging.getLogger("uvicorn.error").setLevel(logging.ERROR)
+
         config = uvicorn.Config(
             self.app,
             host=self.host,
             port=self.port,
-            log_level="warning"
+            log_level="error",  # Only log errors
+            access_log=False,   # Disable access logging
+            log_config=None     # Don't use default logging config
         )
         server = uvicorn.Server(config)
         await server.serve()