fix(website): keep dimmed graph nodes clearly visible under a spotlight

The dim color sat so close to the scene background that spotlighted views read as if the other nodes had been removed. Brighten the dimmed node and link colors so a spotlight grays the rest out instead of hiding it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Claude-Session: https://claude.ai/code/session_01N3Cn3zmu1uUVkYJfwyPFeJ

Author: samchon

website/src/components/graph/TtscWebsiteGraphViewerScene.ts

@@ -14,8 +14,10 @@ type ViewerNode = ITtscWebsiteGraphViewer.Node;
 
 const { LINK_COLORS, NODE_COLORS, linkKey } = TtscWebsiteGraphViewerModel;
 
-const DIMMED_NODE = "#232833";
-const DIMMED_LINK = "#ffffff0a";
+// Dimmed nodes must stay clearly visible against the #0a0c10 background: a
+// spotlight grays the rest out, it never makes them look removed.
+const DIMMED_NODE = "#434c5c";
+const DIMMED_LINK = "#ffffff14";
 const SELECTED_NODE = "#f5f8ff";
 
 /** A handle the React shell uses to drive the imperative scene. */