feat(editor): unify Tiptap editor for editing and readonly display
Replace react-markdown in comment/reply display with Tiptap readonly mode,
ensuring visual consistency between editing and viewing. Extract shared
BaseMentionExtension with MentionView NodeView used in both modes — issue
mentions render as inline cards with StatusIcon, clickable to open in new tab.
Redesign mention suggestion popup with grouped sections (Users/Issues),
agent badges, and StatusIcon for issues.
- New: mention-extension.ts (shared mention core)
- New: mention-view.tsx (shared NodeView for both modes)
- New: readonly-editor.tsx (lightweight Tiptap readonly wrapper)
- Modified: rich-text-editor.tsx (import from shared mention-extension)
- Modified: rich-text-editor.css (readonly + issue-mention overrides)
- Modified: comment-card.tsx (Markdown → ReadonlyEditor)
- Modified: mention-suggestion.tsx (grouped UI, StatusIcon, agent badge)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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