Three issues found while testing the menu bar:
- Preview "did nothing": clicking Preview does switch to read-only
(contenteditable=false), but a read-only surface looks identical to an
editable one, so the change was invisible. Now `[data-mode='preview']`
collapses the bar's formatting groups, leaving just the view controls
(inspector + Edit/Preview) — the bar visibly simplifies.
- Gutter active block: the dashed outline read poorly. Replace it with a
faint primary-tinted fill + a 3px accent bar on the left edge (toward the
grip), so the block the handle acts on is obvious.
- Bold / insert "don't work" with no caret: a selection-dependent command
fired from the menu bar (outside the editable) no-op'd when the editor
was never focused — `toggleMark` bailed on a null selection, and
`insertBlockOfType` silently fell back to the last block. Add a TipTap
`.focus()`-style guard `ensureCaret()` in the provider: when `selection`
is null it drops a collapsed caret at the document start, so marks arm
(stored mark → next typed text) and inserts land predictably after the
first block. Wired into `runCommandName` (marks / align) and
`insertBlockOfType`. The provider freezes the selection across blur, so
this only fires on a never-focused editor.
Verified in-browser: Preview hides the format groups (toggle stays); the
hovered block shows the tinted fill + accent; a fresh editor's Bold now
arms + places a caret. Words tests 477/477 pass; check clean for the
touched files.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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