Rebuild the memo editor as a single CodeMirror 6 "decorated source"
editor. The document is the raw markdown, stored verbatim and styled in
place (markers stay visible), so the editor never serializes a tree back
to markdown — removing the round-trip fidelity bug class (inline images,
setext headings, ordered-list indentation, HTML entities) that the old
editor needed per-case patches for.
- MemoEditor/Editor: CodeMirror 6 + lang-markdown (GFM). Tokens, heading
lines, #tag/@mention, and the autocomplete popover are styled in plain
CSS (Editor/editor.css) with theme tokens, not a CSS-in-JS theme.
- Tab/Shift-Tab nest/outdent list items (marker-aware, ordered items
renumbered so nesting is CommonMark-valid); Escape blurs; #tag
autocomplete sourced from useTagCounts.
- Focus-mode toolbar reimplemented as markdown-text ops; active state read
from the Lezer tree via the backend-agnostic formatting/commands catalog.
- Remove the old serialize-back-to-markdown editor (its Editor dir,
PlainEditor, the editor-mode system) and its now-unused dependencies
(marked, textarea-caret, and the rich-text editor packages).
- Consolidate toolbar components under Toolbar/. Read-only MemoContent
rendering is unchanged.
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