Three rich-text-chrome fixes:
- The active rail tracked the clicked element, so a table cell gave a 39px
rail on a 118px table. `words-active-rail` now climbs to the TOP-LEVEL block
(direct child of content) and spans its full height.
- Delete-block was only in the (hidden) gutter grip menu. Added a Trash button
to the inspector title row — always visible for the active block.
- Deleting a block left the active dangling (it fell back to the first block).
Both delete paths (inspector + gutter menu) now capture the previous block's
id BEFORE the delete (reading the doc AFTER `deleteBlock` returns the wrong
index) and move the active to it — so there's always a sensible active block.
Verified in-browser: clicking a table cell, the rail spans the whole table
(118px); the inspector delete button is present; deleting a block moves the
active to the previous one (e.g. delete "Lists" → active "const greet"). Check
clean for the touched files.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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