Add delete option for save state slots

Add deleteState method to EmulatorCore interface and implement in
Ps1Core and NesCore. Delete button (trash icon) in the in-game
Save/Load menu removes the state file and its screenshot, then
refreshes the slot list.

app/src/main/java/com/lazy/emulate/emulation/EmulatorCore.kt

@@ -42,6 +42,8 @@ interface EmulatorCore {
 
     fun loadState(slot: Int): Boolean
 
+    fun deleteState(slot: Int): Boolean = false
+
     fun getSaveSlotInfo(slot: Int): SaveSlotInfo
 
     fun getScreenshotPath(slot: Int): String? = null

app/src/main/java/com/lazy/emulate/emulation/cores/NesCore.kt

@@ -120,6 +120,14 @@ class NesCore(
         return NativeLibretro.nativeLoadState(path)
     }
 
+    override fun deleteState(slot: Int): Boolean {
+        val state = File(savesDir, "state_$slot.sav")
+        val screenshot = File(savesDir, "state_$slot.jpg")
+        val deleted = state.exists() && state.delete()
+        if (screenshot.exists()) screenshot.delete()
+        return deleted
+    }
+
     override fun getSaveSlotInfo(slot: Int): SaveSlotInfo {
         val file = File(savesDir, "state_$slot.sav")
         val screenshot = File(savesDir, "state_$slot.jpg")

app/src/main/java/com/lazy/emulate/emulation/cores/Ps1Core.kt

@@ -140,6 +140,14 @@ class Ps1Core(
         return NativeLibretro.nativeLoadState(path)
     }
 
+    override fun deleteState(slot: Int): Boolean {
+        val state = File(savesDir, "state_$slot.sav")
+        val screenshot = File(savesDir, "state_$slot.jpg")
+        val deleted = state.exists() && state.delete()
+        if (screenshot.exists()) screenshot.delete()
+        return deleted
+    }
+
     override fun getSaveSlotInfo(slot: Int): SaveSlotInfo {
         val file = File(savesDir, "state_$slot.sav")
         val screenshot = File(savesDir, "state_$slot.jpg")

app/src/main/java/com/lazy/emulate/ui/screens/game/GameScreen.kt

@@ -27,6 +27,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.AspectRatio
+import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.Pause
 import androidx.compose.material.icons.filled.PlayArrow
@@ -309,6 +310,11 @@ fun GameScreen(
                         if (!isPaused) c.resume()
                         showGameMenu = false
                     },
+                    onDelete = { slot ->
+                        val c = core ?: return@GameMenu
+                        c.deleteState(slot)
+                        saveSlots = c.getAllSaveSlots()
+                    },
                     onResume = {
                         if (!isPaused) core?.resume()
                         showGameMenu = false
@@ -436,6 +442,7 @@ private fun GameMenu(
     slots: List<SaveSlotInfo>,
     onSave: (slot: Int) -> Unit,
     onLoad: (slot: Int) -> Unit,
+    onDelete: (slot: Int) -> Unit,
     onResume: () -> Unit
 ) {
     val dateFormat = remember { SimpleDateFormat("MMM d, yyyy  h:mm a", Locale.getDefault()) }
@@ -534,6 +541,19 @@ private fun GameMenu(
                     ) {
                         Text("Load", style = MaterialTheme.typography.labelMedium)
                     }
+
+                    // Delete button
+                    IconButton(
+                        onClick = { onDelete(slot.slot) },
+                        enabled = slot.exists,
+                        modifier = Modifier.size(36.dp)
+                    ) {
+                        Icon(
+                            Icons.Default.Delete,
+                            contentDescription = "Delete save",
+                            tint = if (slot.exists) Color.White.copy(alpha = 0.7f) else Color.White.copy(alpha = 0.2f)
+                        )
+                    }
                 }
             }