Bitesize Reading Library V4.8.0 — Reading Studio Companions

New: Registered Reading Studio launch profile distinct from single-file escape rooms.
New: Full multi-file offline extraction workflow with filesystem picker or manual download instructions.
New: Teacher, Student, Print Center and Reading Toolkit launch shortcuts.
New: Verified Product-ID companion relationships read from Catalogue Manager V4.1.0's published catalog.json, including verified_related_product_index; candidates are not treated as approved.
New: Dedicated Reading Studio card, clear ready/setup state, and student-only share-package download where included.
Preserved: Core reading, traditional registered HTML games, legacy reading packs, Class Assessment, Standards Coverage and existing browser-stored data.
Safety: Stable Product IDs, extraction path checks, size limits, and no automatic title-based catalogue matches or standards approvals.

Release status: Phase 3 TEST BUILD. Browser smoke tests are complete in a controlled harness. A real file:// launch and folder picker test on the user's target browser/device is still required. No user catalogue or Reading Library IndexedDB workspace was overwritten during build.
