feat(ui): editor UX improvements — lowlight, upload, emoji, comment editing
- New QuickEmojiPicker: shared SmilePlus + 8 quick emojis + full picker
- New FileUploadButton: reusable Paperclip upload trigger
- New CodeBlockView: React NodeView with language label + copy button
- CodeBlockLowlight: syntax highlighting in editor (replaces plain codeBlock)
- ReactionBar: brand-tinted pill styles, hideAddButton prop
- Comment header: emoji picker + three-dot menu in top-right
- Comment edit: inline editing with brand border, blur-to-save, Escape-to-cancel
- RichTextEditor: add onBlur prop, markdown paste extension
- Create issue: upload button in footer
- Issue detail: upload button next to reaction bar
- Comment/reply: use FileUploadButton, loading spinners, no optimistic updates
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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