release: AM++ 1.4.2

[Zennmn]

Summary

• Fix custom lyrics refresh during natural playback transitions from native lyrics to an AM++-mapped track.
• Resolve the exact PlayerLyricsViewFragment.o2 seam for Apple Music 6.5.0/6.5.1 and use the Fragment current-item field after Apple's update.
• Preserve ready-late, fail-open, duplicate-I2, and native playback behavior.
• Bump version to 1.4.2 (versionCode 99).

Validation

• :app:testDebugUnitTest --offline --rerun-tasks
• :app:assembleDebug --offline --rerun-tasks
• :app:assembleRelease --offline --rerun-tasks
• :app:lintVitalRelease --offline --rerun-tasks
• git diff --check
• Verified on Apple Music 6.5.1/1583 with the natural cross-song scenario.

Full lintRelease still reports the repository's existing unrelated lint errors in SettingsActivity, LyricBlurRenderer, and AppleMusicCurrentSongIdentityTarget.