fix: playlist edit — cover upload in pencil dialog, remove cover-remove button

Android: camera hero button removed; cover upload moved into edit dialog.
Web: trash icon removed from cover actions in edit modal.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/kotlin/com/novasonic/app/ui/screen/PlaylistDetailScreen.kt

@@ -128,7 +128,7 @@ fun PlaylistDetailScreen(
                         tint = Color.White, modifier = Modifier.size(18.dp),
                     )
                 }
-                // Rename + Cover + Delete buttons (top-right)
+                // Edit + Delete buttons (top-right)
                 Row(
                     Modifier
                         .statusBarsPadding()
@@ -144,18 +144,7 @@ fun PlaylistDetailScreen(
                             .clickable { showRenameDialog = true },
                         contentAlignment = Alignment.Center,
                     ) {
-                        Icon(Icons.Default.Edit, "Umbenennen",
-                            tint = Color.White, modifier = Modifier.size(18.dp))
-                    }
-                    Box(
-                        Modifier
-                            .size(36.dp)
-                            .clip(CircleShape)
-                            .background(Color.Black.copy(alpha = 0.45f))
-                            .clickable { imagePicker.launch("image/*") },
-                        contentAlignment = Alignment.Center,
-                    ) {
-                        Icon(Icons.Default.AddAPhoto, "Cover hochladen",
+                        Icon(Icons.Default.Edit, "Bearbeiten",
                             tint = Color.White, modifier = Modifier.size(18.dp))
                     }
                     Box(
@@ -303,16 +292,14 @@ fun PlaylistDetailScreen(
                         ),
                         modifier = Modifier.fillMaxWidth(),
                     )
-                    if (!pl.coverArt.isNullOrBlank()) {
-                        TextButton(
-                            onClick = { vm.removeCover(); showRenameDialog = false },
-                            modifier = Modifier.fillMaxWidth(),
-                        ) {
-                            Icon(Icons.Default.HideImage, null,
-                                tint = NsOnSurface2, modifier = Modifier.size(16.dp))
-                            Spacer(Modifier.width(6.dp))
-                            Text("Cover entfernen", color = NsOnSurface2, fontSize = 13.sp)
-                        }
+                    TextButton(
+                        onClick = { showRenameDialog = false; imagePicker.launch("image/*") },
+                        modifier = Modifier.fillMaxWidth(),
+                    ) {
+                        Icon(Icons.Default.AddAPhoto, null,
+                            tint = NsAccent, modifier = Modifier.size(16.dp))
+                        Spacer(Modifier.width(6.dp))
+                        Text("Cover hochladen", color = NsAccent, fontSize = 13.sp)
                     }
                 }
             },