Fix verification messaging: distinguish three copy outcomes

Three states:
1. SHA-256 verified (green) — remote hash matched dest hash
2. Copied, no remote checksum (secondary color) — file copied OK,
   device doesn't support sha256sum (Samsung/toybox)
3. Failed (red) — copy exception or hash mismatch

Previously all non-checksum cases showed 'may be corrupt' which
was a false alarm on devices without sha256sum support.

src/main/kotlin/com/bolenpad/photophetch/transfer/Copier.kt

@@ -143,7 +143,11 @@ class Copier(
                 destSha256 = destHash,
                 verified = verified,
                 convertedFromHeic = wasConverted,
-                error = if (!verified) "Hash mismatch — file may be corrupt" else null,
+                error = when {
+                    !verified && remoteHash != null -> "Hash mismatch — file may be corrupt"
+                    !verified -> "Copy failed — file missing or empty"
+                    else -> null
+                },
             )
         } catch (e: Exception) {
             pulledFile?.deleteIfExists()

src/main/kotlin/com/bolenpad/photophetch/ui/VerifyScreen.kt

@@ -224,16 +224,27 @@ private fun ResultSummaryHeader(success: Int, failure: Int, destination: String)
 
 @Composable
 private fun CopyResultRow(result: CopyResult) {
+    val hasRemoteHash = result.sourceSha256 != "(not available)"
+    val isVerifiedWithHash = result.verified && result.error == null && hasRemoteHash
+    val isVerifiedNoHash = result.verified && result.error == null && !hasRemoteHash
+    val isFailed = result.error != null || !result.verified
+
     Row(
         modifier = Modifier.fillMaxWidth().padding(vertical = 4.dp),
         horizontalArrangement = Arrangement.spacedBy(8.dp),
         verticalAlignment = Alignment.CenterVertically,
     ) {
         Icon(
-            if (result.verified && result.error == null) Icons.Default.CheckCircle else Icons.Default.Error,
+            when {
+                isFailed -> Icons.Default.Error
+                else -> Icons.Default.CheckCircle
+            },
             contentDescription = null,
-            tint = if (result.verified && result.error == null)
-                MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.error,
+            tint = when {
+                isFailed -> MaterialTheme.colorScheme.error
+                isVerifiedWithHash -> MaterialTheme.colorScheme.primary
+                else -> MaterialTheme.colorScheme.secondary // verified, no hash
+            },
             modifier = Modifier.size(18.dp),
         )
         Column(modifier = Modifier.weight(1f)) {
@@ -241,19 +252,21 @@ private fun CopyResultRow(result: CopyResult) {
                 "${result.photo.filename} → ${result.destinationPath.fileName}"
             else result.photo.filename
             Text(displayName, style = MaterialTheme.typography.bodySmall, fontWeight = FontWeight.Medium)
-            if (result.error != null) {
-                Text(result.error, style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.error)
-            } else {
             Text(
-                    "${result.photo.sizeBytes / 1024} KB • SHA-256: ${result.destSha256.take(12)}…",
+                when {
+                    isFailed -> result.error ?: "Failed"
+                    isVerifiedWithHash -> "SHA-256 verified · ${result.photo.sizeBytes / 1024} KB"
+                    else -> "Copied · ${result.photo.sizeBytes / 1024} KB (no remote checksum)"
+                },
                 style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                color = when {
+                    isFailed -> MaterialTheme.colorScheme.error
+                    else -> MaterialTheme.colorScheme.onSurfaceVariant
+                },
             )
         }
     }
 }
-}
 
 @Composable
 private fun DeleteConfirmCard(count: Int, onConfirm: () -> Unit, onCancel: () -> Unit) {