Track per-quality-tier failure reasons across all failure paths (stream
error, empty manifest, download exception, stub file, MP4 extraction
failure) and include them in the exhausted-tiers log message so failures
are diagnosable from logs.
When HiRes is configured with no fallback and all tiers are exhausted,
log an actionable hint directing the user to enable Quality Fallback.
Surface Tidal-specific error messages in the UI task on retry
exhaustion: distinguishes HiRes-unavailable (with actionable guidance)
from general Tidal auth/quality failures, rather than showing the
generic Soulseek error string.
Each streaming source (Tidal, Qobuz, HiFi, Deezer) now has an "Allow
quality fallback" checkbox in Settings. When disabled, the source only
tries the exact quality selected — if unavailable, it skips and lets
the orchestrator try the next source. Default is ON (current behavior).
Adds Tidal as a third download source alongside Soulseek and YouTube. Uses the tidalapi library with device-flow authentication to search and download tracks in configurable quality (Low/High/Lossless/HiRes) with automatic fallback. Integrates into the download orchestrator for all modes (Tidal Only, Hybrid with fallback chain), the transfer monitor, post-processing pipeline, and file finder. Frontend includes download settings with quality selector, device auth flow, and dynamic sidebar/dashboard labels that reflect the active download source. No breaking changes for existing users.
