feat(nav): light/dark switch every page + store→rack→crate navigator
- nav.js owns a light/dark toggle (persisted, default light) across all owner pages
- /nav API: spaces, store-layout, rack/{id}, crate/{id} over migrated virtual_* geometry
- /search rebuilt as Store→Rack→Crate drill-down (true rack rotation, per-level slot grid,
crate facing arrows + BACK/FRONT/L/R, search→locate)
- facing convention (directionYaw, slot-grid, rotatedArrows, world composition) in RECORDGOD_NAVIGATOR_PLAN.md
- no-cache HTML routes so deploys show instantly
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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