feat: add Display Profiles builtin control center widget (#2410)

* feat: add Display Profiles builtin control center widget

Adds a new built-in widget that lets users switch between their configured
display profiles directly from the Control Center, without opening Settings.

- Widget shows the active profile name and cycles profiles on pill click
- Detail panel shows all profiles as a button group for direct selection
- Integrates with existing DisplayConfigState/SettingsData singletons
- Follows the same loader/instance pattern as VPN, CUPS, and Tailscale widgets

* fix: refine display profiles widget behavior

quickshell/Modules/ControlCenter/Components/DetailHost.qml

@@ -135,6 +135,12 @@ Item {
                 }
                 builtinInstance = widgetModel.tailscaleBuiltinInstance;
             }
+            if (builtinId === "builtin_display_profiles") {
+                if (widgetModel?.displayProfilesLoader) {
+                    widgetModel.displayProfilesLoader.active = true;
+                }
+                builtinInstance = widgetModel.displayProfilesBuiltinInstance;
+            }
 
             if (!builtinInstance || !builtinInstance.ccDetailContent) {
                 return;