* init multi-tab-node
* dragging logic
* tabs menu
* tabs menu
* markdown import
* markdown export
* improve markdown import and export
* fix exponential backtracking in regex
* fix exponential backtracking in regex
* WIP
* fix: add docx schema
* feat(editor): rework tabs block state, controls and editing
- Keep the active tab in per-viewer plugin state, not in the document
- Update hidden-tab decorations incrementally; diff whole-doc remote updates
- Replace the tabs bubble menu with an in-block toolbar and per-tab actions menu
- Add rename, duplicate, move left/right and delete tab actions
- Rename a tab by double-clicking it; add tabs from a strip button
- Hide inactive tabs with hidden="until-found" and open them on beforematch
- Open the containing tab for search, TOCs, comment links and hash scrolls
- Disallow tabs inside tabs: hide slash item, flatten pastes, refuse drops
- Stop content copied or dragged out of a tab from creating a new tabs block
- Keep the selection anchor and land at the panel end when arrowing into tabs
- Let Enter add a line at the end of a tab instead of leaving the block
- Fix drag handle moves of custom nodes inside tab panels
- Keep editor focus on toolbar clicks so copy and delete work
- Export tabs to Markdown as level 4 headings; drop the tabs Markdown syntax
- Share node copy-to-clipboard between the columns and tabs toolbars
- Raise inactive tab label contrast
* fix(editor): show a compact drag preview for the tabs block
- Add a hidden data-drag-preview chip with the tab labels to the tabs view
- The global drag handle uses it instead of snapshotting the block and its neighbours
- Style the chip outside the editor scope since the handle clones it into the body
* fix(editor): hide the drop cursor while reordering tabs in the tab strip
* fix: better tabs selection, rendering and ids
- Keep selections out of hidden tabs and map chained tab updates
- Drive the tab strip from decorations instead of per-keystroke lookups
- Repair empty and repeated tab ids
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Co-authored-by: Philipinho <16838612+Philipinho@users.noreply.github.com>
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