refactor: use factory functions for hotkey and inserter in main

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

whisper_local/__main__.py

@@ -5,8 +5,8 @@ import logging
 import sys
 
 from whisper_local.config import Config, load_config
-from whisper_local.hotkey import HotkeyListener
-from whisper_local.inserter import Inserter
+from whisper_local.hotkey import create_listener
+from whisper_local.inserter import create_inserter
 from whisper_local.recorder import Recorder
 from whisper_local.transcriber import Transcriber
 
@@ -28,8 +28,8 @@ class App:
             compute_type=config.compute_type,
             language=config.language,
         )
-        self.inserter = Inserter()
-        self.hotkey = HotkeyListener(key_name=config.hotkey)
+        self.inserter = create_inserter()
+        self.hotkey = create_listener(key_name=config.hotkey)
         self.hotkey.on_press = self.on_press
         self.hotkey.on_release = self.on_release