feat: Sprint 7 — integration test, export limit, French accents

feat(frontend): Sprint Fix 4 — React Router, accessibility, translations

fix(frontend): Sprint Fix 3 — type safety, memory leaks, error handling

fix(frontend): fix broken navigation, buttons, and layout issues

feat(frontend): Sprint R2 — retro Home / Desktop

rename: Scriptorium AI → IIIF Studio across entire codebase

fix(sprint-f4-f5): tests faux-positifs, frontend bugs, Dockerfile unique

feat(sprint6-B): validation éditoriale + recherche plein texte

feat(frontend): interface d'administration — Sprint 6 Session A

feat(sprint5): frontend React minimal — visionneuse + 4 couches