(working-set-chip) Working-set status chip, queue labelling and hand-off polish

[krissen]

Summary

Fourth PR in the navigation-overhaul series (after #235–#237). Answers "which file set belongs to which workflow?" on screen.

• The WorkflowBar folder chip is now a dropdown showing all three working sets (queue / scan scope / anchor) with Swedish status lines and opt-in actions (Byt mapp…, Använd i Granska, Använd i Räkna) — never auto-load.
• New display-only subscribeScanScope (adopt-on-mount invariant untouched, documented) and shared/queueStatus.js singleton (late subscribers get current value; the fire-and-forget queue-status event alone can't provide that). File queue header now shows its source folder.
• Fortsätt chain completed: Review and Count now anchor the working folder, so the continue affordance chains import→rename→review→count→culling. New open-count event consumed explicitly by PlayerCount (works when already mounted).
• Hand-off buttons standardized to "Nästa steg: →" (PlayerCount's Gallra stays in its header — live cross-link, rationale in ux-principles). Shared useAnchoredDropdown hook extracted (review follow-up from (workflow-bar) Persistent workflow bar + UX principles doc #236).

Testing

• npm test: 83 files / 784 tests passed
• npm run build:workspace: OK
• Owner's visual pass (light/dark, dropdown) outstanding

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