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

fix(frontend): Sprint 2b — dead code, accessibility, Viewer robustness, ApiError

feat: IIIF-native Sprints 4-5-6 — tiled zoom, exports, cleanup

fix: page IDs with trailing dots, Reader profile handling, Editor 404 UX

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 R3 — retro Reader / Manuscript viewer

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

fix(frontend): escape apostrophes in Reader.tsx JSX strings (TS build error)

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