feat(profiles): add setting to toggle project switcher on main page

Add a show/hide toggle for the header project profile switcher under
the Homepage Display section in settings. Defaults to visible so
existing users keep the current behavior.

src/components/settings/AppVisibilitySettings.tsx

@@ -1,5 +1,7 @@
 import { useTranslation } from "react-i18next";
+import { FolderOpen } from "lucide-react";
 import { Button } from "@/components/ui/button";
+import { ToggleRow } from "@/components/ui/toggle-row";
 import { cn } from "@/lib/utils";
 import { ProviderIcon } from "@/components/ProviderIcon";
 import type { SettingsFormState } from "@/hooks/useSettings";
@@ -91,6 +93,13 @@ export function AppVisibilitySettings({
           );
         })}
       </div>
+      <ToggleRow
+        icon={<FolderOpen className="h-4 w-4 text-emerald-500" />}
+        title={t("settings.appVisibility.showProfileSwitcher")}
+        description={t("settings.appVisibility.showProfileSwitcherDescription")}
+        checked={settings.showProfileSwitcher ?? true}
+        onCheckedChange={(value) => onChange({ showProfileSwitcher: value })}
+      />
     </section>
   );
 }