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/lib/i18n/messages/pl.settings.ts

@@ -1,3 +1,4 @@
+import { thirdPartyIntegrationI18n } from './third-party-integrations.i18n';
 export const settingsDict = {
   'settings.providers.page.openCodeGo.title': 'Śledzenie użycia OpenCode Go',
   'settings.providers.page.openCodeGo.description': 'Połącz panel OpenCode Go, aby wyświetlać limity kroczące, tygodniowe i miesięczne.',
@@ -2125,4 +2126,5 @@ export const settingsDict = {
   'settings.openchamber.visual.field.followUpBehaviorDescription': 'Choose what happens when you press Enter on a follow-up message while the agent is still responding.',
   'settings.openchamber.visual.option.followUpBehavior.steer.label': 'Steer',
   'settings.openchamber.visual.option.followUpBehavior.queue.label': 'Queue',
+  ...thirdPartyIntegrationI18n.pl,
 };