Second phase of the hero canvas editor (see HERO_EDITOR.md).
- new lib/heroLayout.js: shared defaultLayout/buildOverlay/heroBackground/
parseLayout used by both the portal and the editor (Portal refactored onto it)
- new admin view HeroEditor.jsx at /admin/hero (+ sidebar nav + route):
- live canvas preview (16:9) rendering the draft via HeroElement
- background panel: image upload (/admin/uploads, >1MB warning), 3x3 position
grid, overlay opacity slider — all update the canvas in real time
- debounced (800ms) auto-save to hero_layout_draft
- Publish (writes hero_layout + draft), Preview (opens /?preview=1), Revert
- Portal: ?preview=1 renders the draft via the admin settings endpoint, with a
"showing unpublished draft" banner; normal load renders the published layout
No schema/dep changes. Verified end to end: overlay/position update the canvas,
auto-save writes the draft, publish updates the live portal, preview shows the
draft while the public page shows live. Element drag/properties land in Phase 3.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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