feat(desktop): collapsible info panel in chess deck column

Hide GameInfo/MoveHistory/Actions panel by default in deck view
with a chevron toggle to expand. Add Chess to AddColumnDialog.

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

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/chess/ChessScreen.kt

@@ -39,6 +39,8 @@ import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowLeft
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.Refresh
@@ -90,6 +92,7 @@ fun ChessScreen(
     relayManager: DesktopRelayConnectionManager,
     account: AccountState.LoggedIn,
     onBack: () -> Unit = {},
+    compactMode: Boolean = false,
 ) {
     val scope = rememberCoroutineScope()
     val viewModel =
@@ -274,6 +277,7 @@ fun ChessScreen(
                     },
                     onResign = { viewModel.resign(gameState.startEventId) },
                     isSpectatorOverride = isSpectating,
+                    compactMode = compactMode,
                 )
             }
         } else {
@@ -593,6 +597,7 @@ private fun DesktopChessGameLayout(
     onMoveMade: (from: String, to: String, san: String) -> Unit,
     onResign: () -> Unit,
     isSpectatorOverride: Boolean? = null,
+    compactMode: Boolean = false,
 ) {
     // Collect state flows to trigger recomposition on changes
     val currentPosition by gameState.currentPosition.collectAsState()
@@ -604,12 +609,13 @@ private fun DesktopChessGameLayout(
     val opponentPubkey = gameState.opponentPubkey
     val isSpectator = isSpectatorOverride ?: gameState.isSpectator
 
+    var showInfoPanel by remember { mutableStateOf(!compactMode) }
+
     BoxWithConstraints(
         modifier = Modifier.fillMaxSize().padding(16.dp),
     ) {
         // Calculate board size based on available space
-        // Leave room for the info panel (300dp + 24dp spacing)
-        val infoPanelWidth = 300.dp + 24.dp
+        val infoPanelWidth = if (showInfoPanel) 300.dp + 24.dp else 0.dp
         val availableWidth = maxWidth - infoPanelWidth
         val availableHeight = maxHeight
         // Board should fit within available space, maintaining square aspect ratio
@@ -617,11 +623,11 @@ private fun DesktopChessGameLayout(
 
         Row(
             modifier = Modifier.fillMaxSize(),
-            horizontalArrangement = Arrangement.spacedBy(24.dp),
+            horizontalArrangement = Arrangement.spacedBy(if (showInfoPanel) 24.dp else 0.dp),
         ) {
-            // Left side: Chess board
+            // Left side: Chess board + toggle
             Box(
-                modifier = Modifier.fillMaxHeight(),
+                modifier = Modifier.weight(1f).fillMaxHeight(),
                 contentAlignment = Alignment.Center,
             ) {
                 InteractiveChessBoard(
@@ -633,9 +639,26 @@ private fun DesktopChessGameLayout(
                     positionVersion = moveHistory.size,
                     onMoveMade = onMoveMade,
                 )
+
+                // Toggle button anchored to top-end of board area
+                IconButton(
+                    onClick = { showInfoPanel = !showInfoPanel },
+                    modifier = Modifier.align(Alignment.TopEnd),
+                ) {
+                    Icon(
+                        if (showInfoPanel) {
+                            Icons.AutoMirrored.Filled.KeyboardArrowRight
+                        } else {
+                            Icons.AutoMirrored.Filled.KeyboardArrowLeft
+                        },
+                        contentDescription = if (showInfoPanel) "Hide info panel" else "Show info panel",
+                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
             }
 
-            // Right side: Game info, moves, controls
+            // Right side: Game info, moves, controls (collapsible)
+            if (showInfoPanel) {
                 Column(
                     modifier =
                         Modifier
@@ -818,4 +841,5 @@ private fun DesktopChessGameLayout(
                 }
             }
         }
+    }
 }

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/AddColumnDialog.kt

@@ -56,6 +56,7 @@ private val COLUMN_OPTIONS =
         DeckColumnType.Bookmarks,
         DeckColumnType.GlobalFeed,
         DeckColumnType.MyProfile,
+        DeckColumnType.Chess,
     )
 
 @Composable

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt

@@ -276,6 +276,7 @@ internal fun RootContent(
                 relayManager = relayManager,
                 account = account,
                 onBack = {},
+                compactMode = true,
             )
         }