feat(offline): bridge authenticated sessions

[rdlabo]

Summary

• add createOfflineAuthBridge to own the shared credential exchange → remote session preparation → access publication → transport resume lifecycle
• guard every async boundary with auth leases plus provider-subject checks, with optional product object-identity validation
• share offline fallback and background recovery wiring without absorbing product-specific consent, DTO mapping, redirects, or error UI
• document the integration boundary and export the bridge from @rdlabo/ionic-angular-kit/offline

Why

winecode and tipsys currently duplicate this lifecycle in app.config.ts. The duplication is security-sensitive: a logout or account replacement during credential exchange, replica preparation, or transport resume must not publish or persist the old identity. The bridge centralizes those invariants while leaving product policy in callbacks.

Backward compatibility

This change is additive. Existing provideKitAuth hooks and direct OfflineCoordinatorService callers are unchanged. authSubject is required only for identities passed to the new bridge. Existing scope id 0 remains accepted for current tipsys compatibility.

Product migration check

• winecode maps its existing subject to authSubject; its exchange/consent and alert logic remain product-owned
• tipsys carries authSession and redirect data as additional typed identity fields, uses isIdentityCurrent for Firebase object identity, and moves its post-resume redirect to onRemoteResumed

Validation

• npm run prebuild
• npm test (all workspace projects; kit: 509 tests)
• npm run lint
• npm run test:offline-types:nonstrict
• npm run test:actions
• git diff --check

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.