Remove close button from Now Playing sheet

The sheet is dismissed by swiping down, tapping outside it or pressing
Back, so the explicit close button and its now-unused ic_close icon are
dropped.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015g6ECVSKcBG8CJPrqC3G5o

app/src/main/java/cc/skysparkle/fogwave/ui/components/NowPlayingSheet.kt

@@ -169,13 +169,7 @@ fun NowPlayingSheet(
                         .background(LocalGeoColors.current.outlineVariant)
                 )
 
-                Row(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .padding(horizontal = 24.dp, vertical = 10.dp),
-                    horizontalArrangement = Arrangement.SpaceBetween,
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
+                // The sheet closes by swiping down, tapping outside it or pressing Back.
                 Text(
                     text = stringResource(R.string.now_playing_label),
                     style = MaterialTheme.typography.labelSmall.copy(
@@ -183,27 +177,9 @@ fun NowPlayingSheet(
                         fontSize = 11.5.sp,
                         letterSpacing = 1.2.sp,
                         color = LocalGeoColors.current.primary
+                    ),
+                    modifier = Modifier.padding(horizontal = 24.dp, vertical = 12.dp)
                 )
-                    )
-
-                    Box(
-                        modifier = Modifier
-                            .size(36.dp)
-                            .clip(CircleShape)
-                            .background(LocalGeoColors.current.surfaceContainer)
-                            .border(1.dp, LocalGeoColors.current.outlineVariant, CircleShape)
-                            .clickable { onClose() }
-                            .testTag("np_close_btn"),
-                        contentAlignment = Alignment.Center
-                    ) {
-                        AppIcon(
-                            resId = R.drawable.ic_close,
-                            contentDescription = stringResource(R.string.close_content_desc),
-                            tint = LocalGeoColors.current.deepPurple,
-                            size = 18.dp
-                        )
-                    }
-                }
 
                 Box(
                     modifier = Modifier