fix: EvdevHotkeyListener.stop() cancelt Tasks und schließt Devices

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

whisper_local/hotkey/_evdev.py

@@ -37,6 +37,8 @@ class EvdevHotkeyListener:
             raise ValueError(f"Unbekannter Key-Name: {key_name}")
         self.on_press: AsyncCallback | None = None
         self.on_release: AsyncCallback | None = None
+        self._tasks: list[asyncio.Task] = []
+        self._devices: list[InputDevice] = []
 
     async def _handle_key_event(self, key_down: bool) -> None:
         """Ruft den passenden Callback auf."""
@@ -57,13 +59,21 @@ class EvdevHotkeyListener:
                     await self._handle_key_event(key_down=False)
 
     def stop(self) -> None:
-        """Stub — evdev-Listener läuft bis zum Prozessende."""
-        pass
+        """Cancelt laufende Read-Tasks und schließt Devices."""
+        for task in self._tasks:
+            task.cancel()
+        for dev in self._devices:
+            try:
+                dev.close()
+            except Exception:
+                pass
+        self._tasks = []
+        self._devices = []
 
     async def listen(self) -> None:
         """Lauscht auf evdev-Events der konfigurierten Taste auf allen passenden Devices."""
-        devices = find_keyboard_devices(self.key_name)
-        for dev in devices:
+        self._devices = find_keyboard_devices(self.key_name)
+        for dev in self._devices:
             logger.info("Lausche auf %s auf %s (%s)", self.key_name, dev.name, dev.path)
-        tasks = [asyncio.create_task(self._read_device(dev)) for dev in devices]
-        await asyncio.gather(*tasks)
+        self._tasks = [asyncio.create_task(self._read_device(dev)) for dev in self._devices]
+        await asyncio.gather(*self._tasks, return_exceptions=True)