refactor: Simplify TtsEditContainerScreen save logic and update SaveCallBack usage

- Replaced the use of a list iterator with a for-each loop in `TtsEditContainerScreen` for iterating through save callbacks, making the code more concise.
- Changed `LocalSaveCallBack` from `staticCompositionLocalOf` to `compositionLocalOf` for better handling of missing providers.
- Remove `immersionbar` and `immersionbar.ktx` from the project dependencies.
- Add `AndroidFilePicker` dependency.

Author: jing332

app/build.gradle

@@ -190,8 +190,6 @@ dependencies {
     implementation 'me.rosuh:AndroidFilePicker:1.0.1'
 
     implementation(libs.hanlp)
-    implementation(libs.immersionbar)
-    implementation(libs.immersionbar.ktx)
 
 
     implementation(libs.bundles.about)

app/src/main/java/com/github/jing332/tts_server_android/compose/systts/list/ui/widgets/SaveHandler.kt

@@ -2,11 +2,11 @@ package com.github.jing332.tts_server_android.compose.systts.list.ui.widgets
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.compositionLocalOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.staticCompositionLocalOf
 
 internal val LocalSaveCallBack =
-    staticCompositionLocalOf<MutableList<SaveCallBack>> { mutableListOf() }
+    compositionLocalOf<MutableList<SaveCallBack>> { error("No save callbacks") }
 
 internal fun interface SaveCallBack {
     suspend fun onSave(): Boolean

app/src/main/java/com/github/jing332/tts_server_android/compose/systts/list/ui/widgets/TtsEditContainerScreen.kt

@@ -58,10 +58,8 @@ fun TtsEditContainerScreen(
             onSystemTtsChange = onSysttsChange,
             onSave = {
                 scope.launch {
-                    val iterator = callbacks.listIterator(callbacks.size)
-                    while (iterator.hasPrevious()) {
-                        val element = iterator.previous()
-                        if (!element.onSave()) return@launch
+                    for (callBack in callbacks) {
+                        if (!callBack.onSave()) return@launch
                     }
 
                     onSave()