Components: Rich content #14

REQUIREMENTS §22 (Rich content), R13.2. Tiptap (MIT packages only), @tiptap/static-renderer, Shiki. Exported from @javaabu/onu/editor.

• WYSIWYG editor (ARIA toolbar, dir="auto" blocks, HTML/JSON value, FormField-aware)
• ThaanaKeyboard Tiptap extension (Alt+Shift+T, predictive-keyboard words, paste)
• Block editor (slash menu on @tiptap/suggestion, in-house drag handles with keyboard alternatives)
• Block renderer (static, safe by default)
• Code block (Shiki, lazy, dual theme)
• Translations editor
• Custom attribute fields

Merged into claude/amazing-cerf-htnpm8. Coverage 97.5% lines / 91.1% branches. @tiptap/extension-drag-handle-react not used (pulls in Yjs/collaboration).

Follow-ups:

• Figma components + Code Connect (Figma kit & token sync #29)
• Virtualise the translations editor for very long key lists