test(editor): extract refocus re-sync into a unit-tested module

feat(editor): local-first persistence + robust refocus re-sync

feat(editor): embed studio with data files and agent-aware editing

feat(frontend): editor refresh (embed studio, comment popover, shiki, top bar, hooks, styles)

feat: show real HF username and avatar for connected users

fix: prevent seed race condition with Y.Map guard and defensive checks

fix: prevent Y.Doc content duplication from seed race condition

refactor: rename to Science Article Template Editor, remove MDX export, fix settings drawer

fix: replace y-websocket with @hocuspocus /provider for protocol compatibility

fix: resolve TipTap v3 collaboration crash

fix: adapt to StarterKit v3 API changes

chore: upgrade all TipTap packages to v3

chore: initial commit