refactor(android): add shared slot-based TrackRow

android/app/src/main/java/com/fabledsword/minstrel/shared/widgets/TrackRow.kt

@@ -0,0 +1,80 @@
+package com.fabledsword.minstrel.shared.widgets
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+
+/**
+ * Shared track-list row. Replaces the 5 per-screen `TrackRow`s — every
+ * track list shares the same row skeleton (clickable Row, title + artist
+ * column, CachedDot, nowPlaying highlight); only the leading element
+ * (track number vs cover thumb) and the trailing controls (duration,
+ * relative time, LikeButton, TrackActionsButton) vary. Callers fill
+ * those via the [leading] and [trailing] slots so each screen's row is
+ * a thin wrapper that no longer re-implements the Row layout.
+ *
+ * [enabled] gates the click (use for unavailable rows). [contentAlpha]
+ * dims the title + artist text colors — pass <1f for the
+ * playlist-track-unavailable case. The trailing slot is responsible
+ * for applying its own alpha if it should match (the row doesn't
+ * cascade because the trailing slot's content is the caller's, not
+ * ours).
+ */
+@Composable
+fun TrackRow(
+    title: String,
+    artist: String,
+    trackId: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    nowPlaying: Boolean = false,
+    enabled: Boolean = true,
+    contentAlpha: Float = 1f,
+    leading: @Composable () -> Unit = {},
+    trailing: @Composable RowScope.() -> Unit = {},
+) {
+    val titleColor = if (nowPlaying) {
+        MaterialTheme.colorScheme.primary
+    } else {
+        MaterialTheme.colorScheme.onSurface
+    }
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .clickable(enabled = enabled, onClick = onClick)
+            .padding(horizontal = 16.dp, vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        leading()
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.bodyLarge,
+                color = titleColor.copy(alpha = contentAlpha),
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+            if (artist.isNotEmpty()) {
+                Text(
+                    text = artist,
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = contentAlpha),
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+        CachedDot(trackId)
+        trailing()
+    }
+}