feat(settings): add third-party integrations dashboard

Add a Settings → Integrations page for installing and managing the three
supported OpenCode provider plugins (Claude Code, Command Code, Cursor),
with search, i18n, and plugin-registry status wiring.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/components/sections/integrations/IntegrationsPage.tsx

@@ -0,0 +1,29 @@
+import React from 'react';
+import { SettingsPageLayout } from '@/components/sections/shared/SettingsPageLayout';
+import { useI18n } from '@/lib/i18n';
+import { ThirdPartyIntegrationsSection } from './ThirdPartyIntegrationsSection';
+
+interface IntegrationsPageProps {
+  onOpenProviderSetup: (providerId: string) => Promise<boolean>;
+  onOpenPluginManager: () => void;
+}
+
+export const IntegrationsPage: React.FC<IntegrationsPageProps> = ({
+  onOpenProviderSetup,
+  onOpenPluginManager,
+}) => {
+  const { t } = useI18n();
+
+  return (
+    <SettingsPageLayout
+      title={t('settings.page.integrations.title')}
+      description={t('settings.page.integrations.description')}
+      showSaveStatus={false}
+    >
+      <ThirdPartyIntegrationsSection
+        onOpenProviderSetup={onOpenProviderSetup}
+        onOpenPluginManager={onOpenPluginManager}
+      />
+    </SettingsPageLayout>
+  );
+};