BUILD HANDOFF — 2026-03-12 v11

Current beta: index_beta_2026-03-12-v11.html
Current canonical docs: canonical-docs-2026-03-12-v11

Packaging rules:
- ZIP lives inside the date directory and contains no date root folder.
- Root of ZIP contains beta, handoff, and progress only.
- Canonical docs folder contains only changed canonical docs.
- Progress logs do not go inside canonical docs folders.

Build from latest available version rule:
- Every new build must start from the latest accepted version and carry forward explicit prior requirements unless deprecated.

v11 target fixes:
- Download Thumbnail exports full WYSIWYG panel instead of background-only image.
- Export filename standard: MyAnythingThumbnail_YYYY-MM-DD_HHMMSSAM_Resolution.ext
- Thumbnail images default to contain / fit-panel behavior instead of crop.
- Added 4x3 Tube TV aspect option.

Open regressions still needing live verification:
- Startup QR alignment on every startup path.
- Grid slider behavior.
- Fit Height / Fit Everything / Fit Width + Digital exact geometry.
- Header text button visibility.
