Add keyboard navigation foundation #2

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# tidepool-keyboard-demo
# Tidepool Keyboard Demo
An accessible tiny browser demo for exploring a tidepool
A dependency-free browser demo for moving an explorer between tidepool zones.
## Keyboard controls
- ArrowRight and ArrowDown move to the next zone.
- ArrowLeft and ArrowUp move to the previous zone.
- Movement wraps at both ends.
## Review checklist
- Confirm every action has a visible keyboard focus state.
- Confirm the active zone is announced in a live region.
- Confirm wraparound behavior is understandable without a pointer.