c00e270756
Add docs/manual-qa-test-plan.md — the structured manual test plan used for the full-product QA pass against develop: ~190 cases across auth, spaces, pages/tree, editor & blocks, media/embeds, comments, search, notifications, AI chat & dictation, public sharing, permission matrix, cross-feature interactions, and a cross-cutting UI/consistency sweep. Intended as a reusable manual-QA checklist. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>