✨ Add DialoguePNJ component with typewriter effect (Story 2.7)

- Create useReducedMotion composable for motion preferences
- Create useTypewriter composable with accelerate/skip support
- Add DialoguePNJ component with Zelda-style dialogue system
- Add personality-based styling (sage, sarcastique, enthousiaste, professionnel)
- Implement keyboard navigation (arrows, space)
- Add toggle between dialogue and list view modes
- Add i18n translations for dialogue UI

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/implementation-artifacts/sprint-status.yaml

@@ -63,7 +63,7 @@ development_status:
   2-4-page-competences-affichage-categories: review
   2-5-competences-cliquables-projets-lies: review
   2-6-page-temoignages-migrations-bdd: review
-  2-7-composant-dialogue-pnj: ready-for-dev
+  2-7-composant-dialogue-pnj: review
   2-8-page-parcours-timeline-narrative: ready-for-dev
   epic-2-retrospective: optional