fix(cursor): deprecate legacy bridge and harden gitlab auth

tests/unit/ui/provider-config.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'bun:test';
+import {
+  getDeviceCodeProviderInstruction,
+  getProviderDisplayName,
+} from '../../../ui/src/lib/provider-config';
+
+describe('provider-config fallbacks', () => {
+  it('uses translated fallback copy for unknown providers', () => {
+    expect(getProviderDisplayName('not-a-provider')).toBe('Unknown provider: not-a-provider');
+    expect(getProviderDisplayName(undefined)).toBe('Unknown provider: unknown');
+  });
+
+  it('uses translated default device-code guidance for unknown providers', () => {
+    expect(getDeviceCodeProviderInstruction('not-a-provider')).toBe(
+      'Complete the authorization in your browser.'
+    );
+  });
+});