refactor: Enhance TV bezel shading and texture effects for improved visual fidelity

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_renderer/shaders/wolf_world.frag

@@ -29,17 +29,21 @@ void main() {
     centered *= 1.0 + radius2 * 0.045;
     uv = centered * 0.5 + 0.5;
 
-    // Fill outside warped bounds with a subtle gray plastic TV bezel.
+    // Fill outside warped bounds with a darker consumer-TV charcoal bezel.
     if (uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0) {
       vec2 clampedUv = clamp(uv, 0.0, 1.0);
       vec2 edgeDelta = abs(uv - clampedUv);
       float overflow = max(edgeDelta.x, edgeDelta.y);
 
-      float verticalShade = 0.96 + 0.06 * (1.0 - (FlutterFragCoord().y / uResolution.y));
-      float depthShade = 1.0 - smoothstep(0.0, 0.06, overflow) * 0.18;
-      float grain = sin(FlutterFragCoord().x * 0.21 + FlutterFragCoord().y * 0.11) * 0.01;
+      float verticalShade = 0.90 + 0.08 * (1.0 - (FlutterFragCoord().y / uResolution.y));
+      float depthShade = 1.0 - smoothstep(0.0, 0.06, overflow) * 0.24;
+      float grain = sin(FlutterFragCoord().x * 0.21 + FlutterFragCoord().y * 0.11) * 0.007;
+      float moldedHighlight = smoothstep(0.08, 0.0, overflow) * 0.045;
 
-      vec3 bezelColor = vec3(0.46, 0.46, 0.44) * verticalShade * depthShade + vec3(grain);
+      vec3 bezelColor =
+          vec3(0.26, 0.26, 0.25) * verticalShade * depthShade +
+          vec3(moldedHighlight) +
+          vec3(grain);
       fragColor = vec4(bezelColor, 1.0);
       return;
     }