Adds timer-legacy.html — a zero-dependency static page that connects
to the Ontime WebSocket and displays the live countdown for browsers
that cannot parse the Vite-built React bundle (Safari < 14, Chrome < 85).
Also adds a synchronous pre-React guard in index.html that redirects
/timer visitors to the legacy page when Promise.any is unavailable,
matching the Vite build target floor of Safari 14 / Chrome 85.
https://claude.ai/code/session_013MfdwdjdDUnr3akpGSGXa4
* chore: migrate eslint to oxlint
* chore: migrate prettier to oxfmt
* chore: migrate typescript
* chore: toThrow should have a expected value
* chore: cast test value as Day
* chore: small title fix
* chore: mocks should be hoisted
* chore: incorrect async useage
* chore: test should be inside description
* chore: test sohuld include an expeced
* chore: oxfmt
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Co-authored-by: alex-Arc <omnivox@LAPTOP-RC5SNBVV.localdomain>