feat: Add settings button and dialog for configuration management

src/webdrop_bridge/ui/main_window.py

@@ -462,6 +462,11 @@ class MainWindow(QMainWindow):
         about_action.setToolTip("About WebDrop Bridge")
         about_action.triggered.connect(self._show_about_dialog)
 
+        # Settings button on the right
+        settings_action = toolbar.addAction("⚙️")
+        settings_action.setToolTip("Settings")
+        settings_action.triggered.connect(self._show_settings_dialog)
+
         # Check for Updates button on the right
         check_updates_action = toolbar.addAction("🔄")
         check_updates_action.setToolTip("Check for Updates")
@@ -523,6 +528,13 @@ class MainWindow(QMainWindow):
         
         QMessageBox.about(self, f"About {self.config.app_name}", about_text)
 
+    def _show_settings_dialog(self) -> None:
+        """Show Settings dialog for configuration management."""
+        from webdrop_bridge.ui.settings_dialog import SettingsDialog
+        
+        dialog = SettingsDialog(self.config, self)
+        dialog.exec()
+
     def _navigate_home(self) -> None:
         """Navigate to the home (start) URL."""
         home_url = self.config.webapp_url