refactor: 时间选择逻辑下沉至 Dialog、Worker 模板方法抽象、配置访问安全化与代码风格统一

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/Main.py

@@ -24,7 +24,7 @@ def main():
     translator = QTranslator()
     if translator.load(":/res/translators/qtbase_zh_CN.ts"):
         app.installTranslator(translator)
-    app.setStyle('Fusion')
+    app.setStyle("Fusion")
     app.setApplicationName("AutoLibrary")
     if not initializeApp():
         sys.exit(-1)