Bound the notification app list, and give Focus a real editor

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/modules/settings/GamingPage.qml

@@ -123,13 +123,13 @@ SettingsPage {
             detail: {
                 const mode = FocusModes.modes.find(entry => entry.id === "gaming");
                 if (!mode)
-                    return "Handled by a focus mode on Notifications & Focus.";
+                    return "Handled by a focus mode on the Focus tab.";
                 return mode.enabled === true
                     ? "Handled by the Gaming focus mode, which is on."
                     : "The Gaming focus mode is off, so notifications are not silenced.";
             }
             action: "Open Focus"
-            onTriggered: ShellState.settingsPage = "notifications"
+            onTriggered: ShellState.openSettings("focus")
         }
 
         ToggleRow {