code review: remove unsafe casting to avoid app crash if a non-voice reply context leaks through

lint fixes

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/actions/uploads/VoiceMessagePreview.kt

@@ -20,7 +20,6 @@
  */
 package com.vitorpamplona.amethyst.ui.actions.uploads
 
-import android.content.Context
 import android.media.MediaPlayer
 import android.util.Log
 import androidx.compose.foundation.background
@@ -77,7 +76,7 @@ fun VoiceMessagePreview(
 
     // Initialize MediaPlayer
     DisposableEffect(voiceMetadata.url, localFile) {
-        val player = createMediaPlayer(context, voiceMetadata.url, localFile)
+        val player = createMediaPlayer(voiceMetadata.url, localFile)
         player?.setOnCompletionListener {
             isPlaying = false
             progress = 0f
@@ -242,7 +241,6 @@ fun VoiceMessagePreview(
 }
 
 private fun createMediaPlayer(
-    context: Context,
     url: String,
     localFile: File?,
 ): MediaPlayer? =
@@ -256,5 +254,6 @@ private fun createMediaPlayer(
             prepare()
         }
     } catch (e: Exception) {
+        Log.w("VoiceMessagePreview", "Failed to create MediaPlayer", e)
         null
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/ShortNotePostScreen.kt

@@ -479,16 +479,12 @@ private fun NewPostScreenBody(
             )
         }
 
-        BottomRowActions(postViewModel, accountViewModel)
+        BottomRowActions(postViewModel)
     }
 }
 
 @Composable
-private fun BottomRowActions(
-    postViewModel: ShortNotePostViewModel,
-    accountViewModel: AccountViewModel,
-) {
-    val context = LocalContext.current
+private fun BottomRowActions(postViewModel: ShortNotePostViewModel) {
     val scrollState = rememberScrollState()
     Row(
         modifier =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/home/ShortNotePostViewModel.kt

@@ -235,7 +235,7 @@ open class ShortNotePostViewModel :
 
     fun hasLnAddress(): Boolean = account.userProfile().info?.lnAddress() != null
 
-    fun user(): User? = account.userProfile()
+    fun user(): User = account.userProfile()
 
     open fun init(accountVM: AccountViewModel) {
         this.accountViewModel = accountVM
@@ -534,15 +534,16 @@ open class ShortNotePostViewModel :
     private suspend fun createTemplate(): EventTemplate<out Event>? {
         // Check if this is a voice message
         voiceMetadata?.let { audioMeta ->
-            return if (originalNote != null) {
+            // Only create voice reply if original note is also a VoiceEvent
+            val originalVoiceHint = originalNote?.toEventHint<VoiceEvent>()
+            return if (originalVoiceHint != null) {
                 // Create voice reply event
-                @Suppress("UNCHECKED_CAST")
                 VoiceReplyEvent.build(
                     voiceMessage = audioMeta,
-                    replyingTo = originalNote!!.toEventHint<Event>() as com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle<VoiceEvent>,
+                    replyingTo = originalVoiceHint,
                 )
             } else {
-                // Create root voice event
+                // Create root voice event (no reply or original is not a voice message)
                 VoiceEvent.build(
                     voiceMessage = audioMeta,
                 )