Expose a root navigator for global dialogs, show a fallback help sheet
with copy and reopen actions when verification URLs cannot launch, and
schedule the same prompt after a timeout during pending grants.
Let users choose whether signed-session verification opens in the
external browser or in-app browser first, with automatic fallback to
the other mode when launch fails.
- DownloadWithExtensionFallback now immediately surfaces verification_required
when any provider needs verification (availability + download stages),
instead of letting later providers mask it
- classifyDownloadErrorType treats 'session is not authenticated' as
verification_required (Go + Dart side)
- parseExtensionAlbumValue.withTrackFallbacks() derives album artist,
release date, and audio traits from tracks when album-level missing
- albumAudioTraitsFromTracks detects dolby_atmos/hi_res_lossless/lossless
from per-track audio_quality/audio_modes fields
- parseBitDepthSampleRate parses '24bit/96kHz' style quality labels
Classify verification-required and rate-limit errors from extensions, propagate Retry-After seconds through the download fallback, report session-grant success/failure, and add a completeGrant action fallback in the runtime.
zarzet