Ouverture directe du BookPlayer en lecture, corrections éditoriales

- Suppression des phases intro (livre 3D) et cover (page intermédiaire)
  du BookPlayer : le reader s'ouvre directement depuis la home
- Corrections textuelles : about.md, app.config.ts, app.vue
- Mise à jour de GrateWizard app

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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