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## Summary by CodeRabbit
* **New Features**
* Added a new "Hosted Components" app with its own app shell, routing,
auth-aware UI, a handler route, and a welcome page showing the signed-in
user.
* **Chores**
* Added dev tooling and configuration for the new app (build, lint,
typecheck, Vite/TS, package manifest) and updated dev env API URL.
* **Tests**
* Excluded the new app from the test workspace.
* **Bug Fixes**
* Suppressed noisy console errors for a specific internal sentinel and
clarified related error messaging.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Konstantin Wohlwend <n2d4xc@gmail.com>
