Raise minSdk to 31 and update AGENTS.md status

AGENTS.md

@@ -13,7 +13,7 @@
 - **Аудио:** ExoPlayer (Media3) + MediaSession
 - **Фоновые задачи:** WorkManager
 - **Читалка:** собственная Book's Story (jsoup, pdfbox, commonmark)
-- **minSdk:** 26 (план — поднять до 31 позже)
+- **minSdk:** 31
 - **compileSdk/targetSdk:** 36
 
 ## Goal
@@ -77,8 +77,10 @@
   - Audiobook player with ExoPlayer + MediaSession.
   - TTS jobs screen via bookshelf-api.
   - Reading and playback progress sync with periodic WorkManager worker.
-- Current: `feature/ui-polish` builds and produces `app-debug.apk` (~57 MB). Debug APK uploaded as `BookStory-debug-4.apk` to ownCloud.
-- Next: polish / bugfixes, backend endpoint parity for progress sync, test on device, raise minSdk, push to Forgejo once repo is created.
+- Current: `feature/ui-polish` builds and produces `app-debug.apk` (~58 MB). Debug APK uploaded as `BookStory-debug-6.apk` to ownCloud.
+- Polished: PlayerContent and TtsContent labels moved to `strings.xml`; TTS WorkManager observer leak fixed (`TtsModel` removes observer in `onCleared`).
+- Raised `minSdk` from 26 to 31.
+- Next: backend endpoint parity for progress sync, test on device, push to Forgejo once repo is created.
 
 ## WARNs
 

app/build.gradle.kts

@@ -16,7 +16,7 @@ android {
     // Default configuration
     defaultConfig {
         applicationId = "org.dueattendant149.bookshelf"
-        minSdk = 26
+        minSdk = 31
         targetSdk = 36
         versionCode = 14
         versionName = "1.8.0"