fix: resolve wifi crashes, shell injections, race conditions, and add debug mode

- Remove transient NEED_AUTH/DISCONNECTED error paths from wifi connect
- Guard double-callback in connect_wifi_bssid/connect_wifi_with_password
- Shell-quote user paths in wallpaper, screenshot, screenrecorder services
- Fix OSD hide-timer use-after-free and applet_window stale source ID
- Fix brightness poll timer leak on read failure
- Fix spotlight search stale idle source removal
- Lock dbusmenu _cache mutation under _registry_lock
- Fix entry.revision written outside _registry_lock scope
- Add fabric-cli exec wrapper for lock screen (lock_screen.lock())
- Replace hyprlock with lock screen in power menu and dropdown
- Add debug mode toggle in settings (controls log verbosity)
- Add diagnostic logging to globalmenu click chain

src/window/settings/main.py

@@ -334,6 +334,11 @@ class SettingsWindow(Gtk.Window):
         return SettingsPage(
             "General Settings",
             [
+                SettingsRow(
+                    "Debug Mode",
+                    SettingsSwitch("debug"),
+                    "Enable verbose logging for development",
+                ),
                 SettingsRow(
                     "Weather Location",
                     SettingsEntry("weather_location"),