- Add RichTextEditor component with TipTap (ProseMirror-based) editor
- Full toolbar: bold, italic, underline, strikethrough, H1/H2/H3, bullet/numbered lists,
blockquote, inline code, code block, text alignment (left/center/right/justify),
text color picker, link insert/edit, image insert, clear formatting, undo/redo
- Replace old contentEditable div + document.execCommand in ComposeModal
- Add Placeholder extension for empty editor hint
- Add ProseMirror CSS styles (lists, blockquote, code, headings, links, images)
- Update signature/template insertion to work with new editor state
Agent Zero
178bd84fd6