Covers off-canvas drops (reachability invariant: prevent, repair on load,
recover via Layers), the HTML block's dead style props (render/export
mismatch plus a code-editor toolbar), page/site reset, Layers virtual rows
for array-prop composites, and in-builder issue reporting backed by a new
whp.site_builder_reports table and a root-only admin page.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
