feat(player): swipe a queue row left to remove it — #2435

Replaces the trailing X button on the Android queue row, for the same
reason #2395 replaced the grip: horizontal space in the narrowest row in
the app. Web keeps its X — the operator's call, and the right one, since
the constraint being solved doesn't exist there.

SwipeToDismissBox with enableDismissFromStartToEnd = false; a right-swipe
means nothing here and would only delete tracks on a mis-aimed gesture.
The red fill under the row is oxblood (LocalActionColors.destructive), not
colorScheme.error — the design system keeps those apart because an error
is a failure that happened and a destructive action is one about to.

Adds a "Remove from queue" custom accessibility action. Both gestures the
row now relies on are touch-only, and each replaced a control TalkBack
could find, so without this the change would have quietly removed
remove-from-queue for anyone not using touch.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N6vZoJ4Se5YyaqdtGVkap5

android/app/src/main/java/com/fabledsword/minstrel/player/ui/QueueScreen.kt

@@ -25,8 +25,11 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SwipeToDismissBox
+import androidx.compose.material3.SwipeToDismissBoxValue
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.rememberSwipeToDismissBoxState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
@@ -60,12 +63,12 @@ import com.composables.icons.lucide.Lucide
 import com.composables.icons.lucide.Music
 import com.composables.icons.lucide.Trash2
 import com.composables.icons.lucide.Volume2
-import com.composables.icons.lucide.X
 import com.fabledsword.minstrel.models.TrackRef
 import com.fabledsword.minstrel.shared.formatDuration
 import com.fabledsword.minstrel.shared.widgets.EmptyState
 import com.fabledsword.minstrel.shared.widgets.LikeButton
 import com.fabledsword.minstrel.shared.widgets.ServerImage
+import com.fabledsword.minstrel.theme.LocalActionColors
 import kotlin.math.roundToInt
 import kotlinx.coroutines.launch
 
@@ -226,15 +229,77 @@ private fun QueueRow(
     } else {
         Color.Transparent
     }
+    // Swipe left to remove, replacing the X button (#2395 follow-up). Only
+    // end-to-start is enabled: a right-swipe has no meaning here, and leaving it
+    // live would delete tracks on a mis-aimed gesture in either direction.
+    val dismissState = rememberSwipeToDismissBoxState(
+        confirmValueChange = { value ->
+            if (value == SwipeToDismissBoxValue.EndToStart) {
+                onRemove()
+                true
+            } else {
+                false
+            }
+        },
+    )
+    SwipeToDismissBox(
+        state = dismissState,
+        enableDismissFromStartToEnd = false,
+        backgroundContent = { RemoveSwipeBackground() },
+        // The reorder lift lives out here so a row being dragged vertically
+        // carries its swipe container with it rather than sliding out of one.
+        modifier = Modifier
+            .onSizeChanged { rowHeightPx = it.height }
+            .zIndex(if (dragOffsetY != 0f) 1f else 0f)
+            .graphicsLayer { translationY = dragOffsetY },
+    ) {
+        QueueRowContent(
+            track = track,
+            index = index,
+            queueSize = queueSize,
+            isCurrent = isCurrent,
+            liked = liked,
+            highlight = highlight,
+            rowHeightPx = rowHeightPx,
+            onClick = onClick,
+            onToggleLike = onToggleLike,
+            onRemove = onRemove,
+            onMove = onMove,
+            onDragOffset = { dragOffsetY = it },
+        )
+    }
+}
+
+@Suppress("LongParameterList") // Compose row wiring — layout + queue callbacks, not logic.
+@Composable
+private fun QueueRowContent(
+    track: TrackRef,
+    index: Int,
+    queueSize: Int,
+    isCurrent: Boolean,
+    liked: Boolean,
+    highlight: Color,
+    rowHeightPx: Int,
+    onClick: () -> Unit,
+    onToggleLike: () -> Unit,
+    onRemove: () -> Unit,
+    onMove: (Int, Int) -> Unit,
+    onDragOffset: (Float) -> Unit,
+) {
     Row(
         modifier = Modifier
             .fillMaxWidth()
-            .onSizeChanged { rowHeightPx = it.height }
-            .zIndex(if (dragOffsetY != 0f) 1f else 0f)
-            .graphicsLayer { translationY = dragOffsetY }
+            // Opaque: this sits ON TOP of the red remove background, so a
+            // transparent row would show the fill through it at rest.
+            .background(MaterialTheme.colorScheme.surface)
             .background(highlight)
             .clickable(onClick = onClick)
-            .queueReorderActions(index = index, queueSize = queueSize, onMove = onMove)
+            .queueReorderActions(
+                index = index,
+                queueSize = queueSize,
+                onMove = onMove,
+                onRemove = onRemove,
+            )
             .padding(horizontal = 16.dp, vertical = 12.dp),
         verticalAlignment = Alignment.CenterVertically,
         horizontalArrangement = Arrangement.spacedBy(12.dp),
@@ -248,7 +313,7 @@ private fun QueueRow(
                 index = index,
                 queueSize = queueSize,
                 rowHeightPx = rowHeightPx,
-                onOffsetChange = { dragOffsetY = it },
+                onOffsetChange = onDragOffset,
                 onMove = onMove,
             ),
         )
@@ -268,26 +333,57 @@ private fun QueueRow(
             )
         }
         LikeButton(liked = liked, onToggle = onToggleLike)
-        IconButton(onClick = onRemove) {
-            Icon(Lucide.X, contentDescription = "Remove from queue")
+    }
+}
+
+/**
+ * What the row slides off to reveal: the destructive colour with a trash glyph,
+ * pinned to the trailing edge because that is the edge the swipe uncovers.
+ *
+ * Oxblood (LocalActionColors.destructive), NOT colorScheme.error. The design
+ * system keeps those apart deliberately — an error is a failure that already
+ * happened, a destructive action is one about to happen — and using the error
+ * colour here would dress an intentional gesture as a fault report.
+ */
+@Composable
+private fun RemoveSwipeBackground() {
+    val actions = LocalActionColors.current
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(actions.destructive)
+            .padding(horizontal = 24.dp),
+        contentAlignment = Alignment.CenterEnd,
+    ) {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            Icon(Lucide.Trash2, contentDescription = null, tint = actions.onAction)
+            Text(
+                text = "Remove",
+                style = MaterialTheme.typography.labelLarge,
+                color = actions.onAction,
+            )
         }
     }
 }
 
 /**
- * Screen-reader reordering for a queue row.
+ * Screen-reader reordering and removal for a queue row.
  *
- * Replaces the capability the grip icon carried: its contentDescription
- * ("Reorder track") was the ONLY thing telling a screen reader this list could
- * be reordered, and a long-press drag is not operable with TalkBack at all.
- * These are the Android counterpart to the web row's ArrowUp/ArrowDown keys —
- * without them, dropping the grip would have quietly removed reordering for
- * anyone not using touch.
+ * Both gestures this row now relies on — long-press-drag to reorder, swipe to
+ * remove — are touch-only and unavailable under TalkBack, and each replaced a
+ * control that a screen reader COULD find (the grip's "Reorder track", the X's
+ * "Remove from queue"). Without these actions the row would have lost both
+ * capabilities for anyone not using touch. They're the Android counterpart to
+ * the web row's ArrowUp/ArrowDown keys and its still-present X button.
  */
 private fun Modifier.queueReorderActions(
     index: Int,
     queueSize: Int,
     onMove: (Int, Int) -> Unit,
+    onRemove: () -> Unit,
 ): Modifier = semantics {
     customActions = listOf(
         CustomAccessibilityAction("Move up") {
@@ -296,6 +392,7 @@ private fun Modifier.queueReorderActions(
         CustomAccessibilityAction("Move down") {
             if (index < queueSize - 1) { onMove(index, index + 1); true } else false
         },
+        CustomAccessibilityAction("Remove from queue") { onRemove(); true },
     )
 }