Four feedback fixes:
- Grip "trembles": the handle's `:hover` did `scale(1.18)`, which grew the
button under the cursor and shifted its hitbox → a hover↔scale feedback
loop. Removed the hover transform; the grip is ambient (per EV-G doctrine).
- Active-block marker was a box/rail tied to the HOVERED block. Moved it to a
vertical accent rail in the GUTTER driven by `[data-words-active]::before`,
so it tracks the CLICKED block (the inspector's target), 0.7rem left of the
block, spanning its height, depth-coloured. Removed the gutter component's
hover overlay div.
- Preview showed empty columns' dashed border + min-height (editing
affordances). `[data-mode='preview']` now makes the column border
transparent and min-height 0 — empty columns vanish in the read-only view.
Verified in-browser: active rail sits 11px left of the clicked block (violet,
3px, full height); column border is transparent + min-height 0 in preview;
grip has no hover transform. Check clean for the touched files.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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