v4.2.4: Fix Dolby Atmos download capability, harden DASH parsing, and bump version

[ajisth69]

Changes in 4.2.4

• Dolby Atmos Downloads: Aligned spatial audio capability detection in \TrackDownloadManager\ with \MusicPlayer's system \Spatializer\ check, resolving Atmos download skips on Android 12L+ devices.
• DASH Manifest Parser Robustness: Added resilient XML attribute matching, case-insensitive tag handling, and strict URL scheme checks to prevent malformed segment URLs during segmented downloads.
• Progressive Stream Badging: Corrected container detection and quality badge mapping for direct progressive Atmos streams.
• Playback Warmup & Retry Gating: Implemented first-song OPUS warmup and tap-to-retry gating to prevent premature auto-skips on transient stream hiccups.
• Version Bump: Bumped version to 4.2.4 (versionCode 24) across Gradle, docs, and runtime constants.