Integrate reader loading and motion fixes with persisted preferences #102

Requirements: FR-3_1, FR-3_2.

Integrate the reader's interrupted-animation fix and the follow-up opening/motion improvements from PapyrusReader/reader#13.

Acceptance:

• Pin the same committed reader SHA in the manifest and lockfile.
• Connect the existing saved Page turn animation preference when opening a book.
• Persist changes from reader settings so the choice survives reopening.
• Keep loading feedback consistent through file loading and initial pagination.
• Preserve local dependency overrides and reading locations.
• Validate locked Git resolution, adapter/session/page/theme/persistence tests and client checks.

Implementation and evidence: #103.