Reworks the active-block marker per feedback (it changed colour by depth,
shifted right for nested blocks, and showed nothing on load):
- New `words-active-rail.svelte`: a single vertical bar in the gutter whose
top/height track the CLICKED block, re-measured on activation / render /
scroll. It is FRAME-relative at a fixed gutter column (CSS
`--_words-content-px - 1.4rem`), so it never shifts right for nested blocks,
and uses ONE fixed colour (`--color-primary-solid`).
- Removed the block-anchored `[data-words-active]::before` rail (block-relative
→ shifted; depth-coloured → changed colour).
- `words-activate.svelte`: there is now ALWAYS an active block — on first load
it seeds the first top-level block, so the inspector + rail have a target
instead of "nothing selected".
Verified: on load the first block is active and the rail shows at a fixed 27px
gutter column, 3px, single colour, height = active block. Check clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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