Refactor authorize page to move Next.js dependencies into the page shell
and have Next.js-agnostic code for the core logic. Add unit tests for
authorize screen.
## Summary by CodeRabbit
* **New Features**
* New end-to-end API authorization UI: loading, error, invalid,
approved, and main approval screens.
* Organization selector with preselection, create-organization link, MCP
warning, expiration handling, and approve/decline actions.
* Improved page title handling via layout/head provider.
* **Tests**
* Added comprehensive component tests covering loading, error, approval
flows, organization states, validation, and side effects.
Charis
6563dc7998