app/routers/library.py: /api/library/recents|favorites|shared|published|private|workspace
app/routers/sharing.py: /api/pages/{id}/share|publish + page_shares
app/templates/base.html: OAuth badge 🦎/🐙, '→ Library' buttons
app/templates/library.html: page avec tabs + filtres source
app/routers/dashboard.py: auth_method + github_linked dans context
tests/test_app.py: tests library + sharing + recents