Inserting an image into a column (slash menu or inspector "Add block")
left an empty trailing paragraph beside it. An image is a placeholder
configured through the inspector (URL panel), not a block you type after,
so the trailing paragraph was pure noise — the reported bug.
insertIntoColumn / insertIntoCell / insertBlockInColumn now skip the
trailing paragraph for images and return a null (caret-free) selection:
the atomic image has no inline text to host a caret, and the provider
auto-activates it for the URL panel. A divider keeps its trailing
paragraph (it separates typed content); table/callout keep theirs too
(they carry inline text, so the caret stays in the block).
5 new engine tests pin the behavior across both insert paths + the cell
case; divider regression guarded. Browser-verified: image into a column
yields [image] only, no empty text block.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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