chore: add prettier config and fix tooltip hover intensity
- Add prettier with useTabs: true (matches existing style)
- Add format and format:check scripts
- Reduce avatar hover effect from scale(1.2) to scale(1.08)
- Reduce lift from 3px to 2px for subtler interaction
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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