feat(settings): Codex Bağlama, on by default

Settings → Codex Bağlama runs the bundled bridge for an OpenAI Codex install on
the same computer: the IDE's models and combos appear in Codex and switching
models keeps the conversation. The IDE points Codex's openai_base_url at the
bridge only after the bridge answers, keeps it running across logins, and
removes every trace when the setting is turned off. A Codex that already uses
another base URL is left untouched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HRDGW1LiKcDUZYUdKBoWYW

apps/desktop/vitest.mobile.config.ts

@@ -6,7 +6,8 @@ export default defineConfig({
     include: [
       'electron/mobile-*.test.ts',
       'electron/first-run-setup*.test.ts',
-      'electron/primary-backend-startup.test.ts'
+      'electron/primary-backend-startup.test.ts',
+      'electron/codex-link*.test.ts'
     ]
   }
 })