fix: remove duplicate 3D option declarations in ConnectionDropMenu

The rebase introduced duplicate THREE_D_TARGET_OPTIONS and
THREE_D_SOURCE_OPTIONS declarations from the squashed release commit.

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

src/components/ConnectionDropMenu.tsx

@@ -367,32 +367,6 @@ const THREE_D_SOURCE_OPTIONS: MenuOption[] = [
   },
 ];
 
-// 3D target options (nodes that accept 3D input)
-const THREE_D_TARGET_OPTIONS: MenuOption[] = [
-  {
-    type: "glbViewer",
-    label: "3D Viewer",
-    icon: (
-      <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
-        <path strokeLinecap="round" strokeLinejoin="round" d="M21 7.5l-2.25-1.313M21 7.5v2.25m0-2.25l-2.25 1.313M3 7.5l2.25-1.313M3 7.5l2.25 1.313M3 7.5v2.25m9 3l2.25-1.313M12 12.75l-2.25-1.313M12 12.75V15m0 6.75l2.25-1.313M12 21.75V19.5m0 2.25l-2.25-1.313m0-16.875L12 2.25l2.25 1.313M21 14.25v2.25l-2.25 1.313m-13.5 0L3 16.5v-2.25" />
-      </svg>
-    ),
-  },
-];
-
-// 3D source options (nodes that produce 3D output)
-const THREE_D_SOURCE_OPTIONS: MenuOption[] = [
-  {
-    type: "generate3d",
-    label: "Generate 3D",
-    icon: (
-      <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
-        <path strokeLinecap="round" strokeLinejoin="round" d="M21 7.5l-2.25-1.313M21 7.5v2.25m0-2.25l-2.25 1.313M3 7.5l2.25-1.313M3 7.5l2.25 1.313M3 7.5v2.25m9 3l2.25-1.313M12 12.75l-2.25-1.313M12 12.75V15m0 6.75l2.25-1.313M12 21.75V19.5m0 2.25l-2.25-1.313m0-16.875L12 2.25l2.25 1.313M21 14.25v2.25l-2.25 1.313m-13.5 0L3 16.5v-2.25" />
-      </svg>
-    ),
-  },
-];
-
 interface ConnectionDropMenuProps {
   position: { x: number; y: number };
   handleType: "image" | "text" | "video" | "audio" | "3d" | "easeCurve" | null;