Sprint 18.F — Run post-Sprint Metadata browser QA

[maruson08]

Acceptance: exercise Image JPEG/PNG/WebP and representative PDF; source/remove, details, default/custom clean, verification, save/cancel/failure, Light/Dark, representative six locales, narrow width, keyboard and Network panel; report PASS/FAIL/BLOCKED honestly.

[maruson08]

Completed in #51; browser QA was attempted and its Windows ACL environment blocker is documented in the merged v2 QA record.