fix: resolve iOS scroll lock after closing comment sheet via X button
On iOS PWA, tapping the close button inside the fixed sheet would cause
iOS to lose track of the scroll context, freezing page scroll. Fixed by:
- Adding touch-action: manipulation to prevent gesture tracking issues
- Blurring active element before close to release iOS focus
- Using requestAnimationFrame to let iOS finish touch processing
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>