refactor: Restructure GUI components into separate modules for improved maintainability

tidal_dl_ng/gui/updates.py

@@ -0,0 +1,25 @@
+"""Updates mixin for MainWindow.
+
+Handles application update checking.
+"""
+
+from tidal_dl_ng import update_available
+from tidal_dl_ng.dialog import DialogVersion
+from tidal_dl_ng.model.meta import ReleaseLatest
+
+
+class UpdatesMixin:
+    """Mixin containing update checking methods."""
+
+    def on_update_check(self, on_startup: bool = True) -> None:
+        """Check for application updates and emit update signals."""
+        is_available, info = update_available()
+
+        if (on_startup and is_available) or not on_startup:
+            self.s_update_show.emit(True, is_available, info)
+
+    def on_version(
+        self, update_check: bool = False, update_available: bool = False, update_info: ReleaseLatest | None = None
+    ) -> None:
+        """Show the version information dialog."""
+        DialogVersion(self, update_check, update_available, update_info)