Lagrange v1.5.3-issue-169-debug-1

Fix

Added live whole-number book and chapter progress percentages to the full audiobook player seek labels in portrait and landscape.
The compact player intentionally omits these percentage labels.

The user confirmed the behavior works on-device.
Local verification passed the full 730-test JVM suite with zero failures, errors, or skips.
Main and Android-test Kotlin compilation passed.
lintDebug passed with 0 errors and 51 warnings.
Debug and Android-test APK assembly passed.
Debug APK: Lagrange-debug-202609211041.apk
SHA-256: 53a176b14d4a47ca57e560e5f1fc3647dc24475d96909b4e5b837cd473e9b270
No assistant-side connected device was available; the device result above is user-confirmed validation.