UI/TTS improvements

composeApp/src/jvmMain/kotlin/net/sergeych/toread/BookPlatform.jvm.kt

@@ -574,12 +574,17 @@ private fun libraryLogFile(): File =
     File(System.getProperty("user.home"), ".toread/toread.log")
 
 private fun ReadingPosition.toFormatHintsJson(): String =
-    """{"firstVisibleItemIndex":$itemIndex,"firstVisibleItemScrollOffset":$scrollOffset}"""
+    buildString {
+        append("""{"firstVisibleItemIndex":$itemIndex,"firstVisibleItemScrollOffset":$scrollOffset""")
+        readAloudSentenceIndex?.let { append(""","readAloudSentenceIndex":$it""") }
+        append("}")
+    }
 
 private fun String.toReadingPosition(): ReadingPosition? {
     val index = Regex(""""firstVisibleItemIndex"\s*:\s*(\d+)""").find(this)?.groupValues?.getOrNull(1)?.toIntOrNull()
     val offset = Regex(""""firstVisibleItemScrollOffset"\s*:\s*(\d+)""").find(this)?.groupValues?.getOrNull(1)?.toIntOrNull()
-    return if (index != null && offset != null) ReadingPosition(index, offset) else null
+    val sentenceIndex = Regex(""""readAloudSentenceIndex"\s*:\s*(\d+)""").find(this)?.groupValues?.getOrNull(1)?.toIntOrNull()
+    return if (index != null && offset != null) ReadingPosition(index, offset, sentenceIndex) else null
 }
 
 private fun String.toSearchPrefixes(): List<String> =

composeApp/src/jvmMain/kotlin/net/sergeych/toread/ReadAloudPlatform.jvm.kt

@@ -10,7 +10,7 @@ actual object ReadAloudPlatform {
     private val mutableSettingsState = MutableStateFlow(ReadAloudSettingsState())
     actual val settingsState: StateFlow<ReadAloudSettingsState> = mutableSettingsState
 
-    actual fun prepare(bookTitle: String, sentences: List<ReadAloudSentence>, startIndex: Int) = Unit
+    actual fun prepare(fileId: String, bookTitle: String, sentences: List<ReadAloudSentence>, startIndex: Int) = Unit
     actual fun play() = Unit
     actual fun stop() = Unit
     actual fun skip(delta: Int) = Unit