Finish the wonderland: System told truthfully, in eight tabs instead of ten

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

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

@@ -11,9 +11,16 @@ Rectangle {
         && pageLoader.item.objectName === "my-home-page"
         ? pageLoader.item.pageDiagnostics
         : ({})
+    // The objectName check alone is not enough. This binding re-evaluates
+    // while the loader is swapping pages, and for a moment `item` is the new
+    // page carrying the old objectName -- calling uiDiagnostics() on it threw
+    // a TypeError every time somebody navigated away from System Health.
+    // Asking whether the function is actually there is the only test that
+    // holds during the swap.
     readonly property var healthDiagnostics: pageLoader.status === Loader.Ready
         && pageLoader.item
         && pageLoader.item.objectName === "system-health-page"
+        && typeof pageLoader.item.uiDiagnostics === "function"
         ? pageLoader.item.uiDiagnostics()
         : ({})
 
@@ -181,7 +188,6 @@ Rectangle {
             case "mouse": return mousePage;
             case "dictation": return dictationPage;
             case "privacy": return privacyPage;
-            case "region": return regionPage;
             case "accounts": return onlineAccountsPage;
             case "accessibility": return accessibilityPage;
             case "power": return powerPage;
@@ -267,7 +273,6 @@ Rectangle {
     Component { id: mousePage; MousePage {} }
     Component { id: dictationPage; DictationPage {} }
     Component { id: privacyPage; PrivacyPage {} }
-    Component { id: regionPage; RegionPage {} }
     Component { id: onlineAccountsPage; OnlineAccountsPage {} }
     Component { id: healthPage; HealthPage {} }
     Component { id: manualPage; ManualPage {} }