Rich-text editor for posts, comments, docs, tickets, and changelog

Replace textarea/Markdown-only authoring with a friendly editor for non-technical users. Use Tiptap or Lexical with Markdown serialization underneath so existing content remains portable. Required blocks: headings, lists, links, code, quotes, images, mentions, slash commands, tables for docs, and paste cleanup from Google Docs/Notion/GitHub.

Security: sanitize HTML on input/output, preserve Markdown source where relevant, support read-only rendering on public surfaces, and keep keyboard shortcuts sane. This unlocks support tickets, changelog drafting, docs authoring, and AI Suggest diffs feeling polished instead of raw.