refactor: 迁移至官方 PredictiveBackHandler，移除 navigationevent-compose 依赖

使用 androidx.activity.compose.PredictiveBackHandler (Flow<BackEventCompat> 模式)
替换 JetBrains NavigationBackHandler，提升设备兼容性。

gradle/libs.versions.toml

@@ -16,7 +16,6 @@ material3 = "1.10.0-alpha05"
 kotlinx-datetime = "0.8.0"
 tyme4kt = "1.4.5"
 sketch = "4.4.0"
-navigationevent = "1.0.1"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
@@ -35,7 +34,6 @@ tyme4kt = { module = "cn.6tail:tyme4kt", version.ref = "tyme4kt" }
 sketch-compose = { module = "io.github.panpf.sketch4:sketch-compose", version.ref = "sketch" }
 sketch-animated-gif = { module = "io.github.panpf.sketch4:sketch-animated-gif", version.ref = "sketch" }
 sketch-compose-resources = { module = "io.github.panpf.sketch4:sketch-compose-resources", version.ref = "sketch" }
-navigationevent-compose = { module = "org.jetbrains.androidx.navigationevent:navigationevent-compose", version.ref = "navigationevent" }
 
 [plugins]
 androidApplication = { id = "com.android.application", version.ref = "agp" }

shared/build.gradle.kts

@@ -49,7 +49,6 @@ kotlin {
             implementation(libs.sketch.compose)
             implementation(libs.sketch.animated.gif)
             implementation(libs.sketch.compose.resources)
-            implementation(libs.navigationevent.compose)
         }
         commonTest.dependencies {
             implementation(libs.kotlin.test)

shared/src/androidMain/kotlin/plus/rua/project/Platform.android.kt

@@ -1,13 +1,12 @@
 package plus.rua.project
 
 import android.os.Build
+import androidx.activity.BackEventCompat
 import androidx.activity.compose.BackHandler
+import androidx.activity.compose.PredictiveBackHandler
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.navigationevent.NavigationEventInfo
-import androidx.navigationevent.NavigationEventTransitionState
-import androidx.navigationevent.compose.NavigationBackHandler
-import androidx.navigationevent.compose.rememberNavigationEventState
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.flow.Flow
 
 class AndroidPlatform : Platform {
     override val name: String = "Android ${Build.VERSION.SDK_INT}"
@@ -26,19 +25,15 @@ actual fun PredictiveBackHandler(
     onBack: () -> Unit,
     onCancel: () -> Unit
 ) {
-    val navState = rememberNavigationEventState(NavigationEventInfo.None)
-
-    NavigationBackHandler(
-        state = navState,
-        isBackEnabled = enabled,
-        onBackCancelled = onCancel,
-        onBackCompleted = onBack
-    )
-
-    LaunchedEffect(navState.transitionState) {
-        val ts = navState.transitionState
-        if (ts is NavigationEventTransitionState.InProgress) {
-            onProgress(ts.latestEvent.progress)
+    // 官方 PredictiveBackHandler — Flow 模式：collect 完成=返回，CancellationException=取消
+    PredictiveBackHandler(enabled = enabled) { progress: Flow<BackEventCompat> ->
+        try {
+            progress.collect { event ->
+                onProgress(event.progress)
+            }
+            onBack()
+        } catch (e: CancellationException) {
+            onCancel()
         }
     }