Hide trailing indicators in catalog models and expanded family headers

Removed visual clutter by hiding trailing indicators when they don't provide actionable information:
- Catalog models: hide arrow.down indicator for compatible models (keep nosign for incompatible)
- Family headers: hide chevron when expanded (keep chevron.right when collapsed with size labels)

This creates a cleaner, more focused UI where indicators only appear when they convey meaningful state information.

Author: erusev

LlamaBarn/Menu/CatalogModelItemView.swift

@@ -161,16 +161,18 @@ final class CatalogModelItemView: ItemView {
 
     // Status-specific display
     // Catalog items only show available models (compatible or incompatible)
-    let symbolName = compatible ? "arrow.down" : "nosign"
-    statusIndicator.image = NSImage(systemSymbolName: symbolName, accessibilityDescription: nil)
+    // Show nosign indicator for incompatible models, hide for compatible
+    if compatible {
+      statusIndicator.isHidden = true
+    } else {
+      statusIndicator.isHidden = false
+      statusIndicator.image = NSImage(systemSymbolName: "nosign", accessibilityDescription: nil)
+      statusIndicator.contentTintColor = Typography.tertiaryColor
+    }
 
     // No tooltips for catalog items
     toolTip = nil
 
-    // Colors: status indicator only (label color is handled in makeModelNameAttributedString)
-    statusIndicator.contentTintColor =
-      compatible ? Typography.secondaryColor : Typography.tertiaryColor
-
     // Clear highlight if no longer actionable
     if !highlightEnabled { setHighlight(false) }
     needsDisplay = true

LlamaBarn/Menu/FamilyHeaderView.swift

@@ -75,8 +75,13 @@ final class FamilyHeaderView: ItemView {
   }
 
   private func updateChevron() {
-    let imageName = isCollapsed ? "chevron.right" : "chevron.down"
-    chevronImageView.image = NSImage(systemSymbolName: imageName, accessibilityDescription: nil)
+    if isCollapsed {
+      chevronImageView.isHidden = false
+      chevronImageView.image = NSImage(
+        systemSymbolName: "chevron.right", accessibilityDescription: nil)
+    } else {
+      chevronImageView.isHidden = true
+    }
   }
 
   private func updateAccessibilityLabel() {