The gutter grip rendered (cursor: grab) but the drag-to-move
functionality was lost when the soma-DragDrop migration was abandoned —
clicking it only opened the action menu (Move up / Move down). Restore
the reorder as native HTML5 drag-drop:
- words-block-drag-type.ts: private MIME `application/x-words-block` the
grip writes (its top-level index) and the controller reads, so block
reorders are told apart from native text drags.
- words-block-gutter.svelte: the grip's DropdownMenu.Trigger is now
`draggable`; `ondragstart` stamps the block index on the transfer. The
menu still opens on click (the dropdown opens on click, not
pointerdown — no collision with the drag gesture).
- words-block-drag.svelte: the drop sink. Listens on the contenteditable
for dragover/drop, paints a horizontal indicator at the nearest
inter-block seam, and repositions via the engine's `moveBlockTo`
(target is post-removal: `to = from < n ? n - 1 : n`). Bails unless the
drag carries our private type, leaving native text drag untouched.
A document-capture `dragend` clears the indicator wherever the drag ends.
- words.svelte: mount the controller next to the gutter.
- words.css: `[data-words-block-drop-line]` accent indicator.
Reorder is top-level only (the gutter is top-level only), mirroring the
gutter's `[data-words-node='block']` block detection exactly.
Verified in-browser: grip is draggable=true; dragstart writes index;
dragover paints the indicator + preventDefaults; drop reorders correctly
downward (0→end) and upward (14→1) with no block lost; native text drags
are not hijacked; no console errors.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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