Refactor ConnectView profile state management (v2.8)

- Improved accessibility in `UserSettings.tsx` by utilizing a `visuallyHidden` style object for unit system descriptions.
- Expanded integration tests in `page.test.tsx` to verify component orchestration and metadata updates.
- Fixed UI/UX inconsistency for imperial height errors using MUI standard components.
- Ensured raw numeric state consistency across unit systems.
- Verified all 653 unit tests and 5 VRT tests pass.
- Resolved all linting and Prettier issues.

Co-authored-by: arii <342438+arii@users.noreply.github.com>

Author: google-labs-jules[bot]