feat(settings): add app visibility settings

Allow users to choose which apps (Claude, Codex, Gemini, OpenCode) to display on the homepage.

- Add VisibleApps type and settings field in both frontend and backend
- Refactor AppSwitcher to render apps dynamically based on visibility
- Extract ToggleRow component for reuse
- Add i18n support for app visibility settings

src/components/settings/SettingsPage.tsx

@@ -34,6 +34,7 @@ import { settingsApi } from "@/lib/api";
 import { LanguageSettings } from "@/components/settings/LanguageSettings";
 import { ThemeSettings } from "@/components/settings/ThemeSettings";
 import { WindowSettings } from "@/components/settings/WindowSettings";
+import { AppVisibilitySettings } from "@/components/settings/AppVisibilitySettings";
 import { DirectorySettings } from "@/components/settings/DirectorySettings";
 import { ImportExportSection } from "@/components/settings/ImportExportSection";
 import { AboutSection } from "@/components/settings/AboutSection";
@@ -240,6 +241,10 @@ export function SettingsPage({
                     onChange={(lang) => handleAutoSave({ language: lang })}
                   />
                   <ThemeSettings />
+                  <AppVisibilitySettings
+                    settings={settings}
+                    onChange={handleAutoSave}
+                  />
                   <WindowSettings
                     settings={settings}
                     onChange={handleAutoSave}

src/components/settings/WindowSettings.tsx

@@ -1,7 +1,7 @@
-import { Switch } from "@/components/ui/switch";
 import { useTranslation } from "react-i18next";
 import type { SettingsFormState } from "@/hooks/useSettings";
 import { AppWindow, MonitorUp, Power } from "lucide-react";
+import { ToggleRow } from "@/components/ui/toggle-row";
 
 interface WindowSettingsProps {
   settings: SettingsFormState;
@@ -58,40 +58,3 @@ export function WindowSettings({ settings, onChange }: WindowSettingsProps) {
     </section>
   );
 }
-
-interface ToggleRowProps {
-  icon: React.ReactNode;
-  title: string;
-  description?: string;
-  checked: boolean;
-  onCheckedChange: (value: boolean) => void;
-}
-
-function ToggleRow({
-  icon,
-  title,
-  description,
-  checked,
-  onCheckedChange,
-}: ToggleRowProps) {
-  return (
-    <div className="flex items-center justify-between gap-4 rounded-xl border border-border bg-card/50 p-4 transition-colors hover:bg-muted/50">
-      <div className="flex items-center gap-3">
-        <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-background ring-1 ring-border">
-          {icon}
-        </div>
-        <div className="space-y-1">
-          <p className="text-sm font-medium leading-none">{title}</p>
-          {description ? (
-            <p className="text-xs text-muted-foreground">{description}</p>
-          ) : null}
-        </div>
-      </div>
-      <Switch
-        checked={checked}
-        onCheckedChange={onCheckedChange}
-        aria-label={title}
-      />
-    </div>
-  );
-}