feat(chat-input): replace transition animations with fade-in keyframe by GCWing · Pull Request #166 · GCWing/BitFun

@GCWing

- Remove max-width and layout transitions to eliminate janky layout shifts
- Add bitfun-box-fade-in keyframe animation for collapsed and expanded states
- Simplify box-shadow/border/background transitions to 0.2s ease
- Speed up target-switcher fade-in from 0.18s to 0.1s
- Remove redundant all-property transition from input row

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Co-Authored-By: BitFun