feat: update theme toggle button text and adjust UV mapping threshold for improved rendering

index.html

@@ -32,8 +32,8 @@
       <span>CNC Kitchen STL Texturizer</span>
     </div>
     <button id="theme-toggle" class="theme-toggle" title="Toggle light / dark mode" aria-label="Toggle light/dark mode" style="margin-left:auto">
-      <span class="icon-moon">Dark</span>
-      <span class="icon-sun">Light</span>
+      <span class="icon-moon">Dark Theme</span>
+      <span class="icon-sun">Light Theme</span>
     </button>
   </header>
 

js/mapping.js

@@ -65,7 +65,7 @@ export function computeUV(pos, normal, mode, settings, bounds) {
       const C  = TWO_PI * Math.max(r, 1e-6);
       const rx = pos.x - center.x;
       const ry = pos.y - center.y;
-      if (Math.abs(normal.z) > 0.5) {
+      if (Math.abs(normal.z) > 0.7) {
         // Cap face — normalise by C so one tile = same world size as on the side
         u = rx / C + 0.5;
         v = ry / C + 0.5;

js/previewMaterial.js

@@ -97,7 +97,7 @@ const fragmentShader = /* glsl */`
       //   fills the diameter × diameter square so the disc looks fully textured.
       float r = max(boundsSize.x, boundsSize.y) * 0.5;
       float C = TWO_PI * max(r, 1e-4);
-      if (abs(vModelNormal.z) > 0.5) {
+      if (abs(vModelNormal.z) > 0.7) {
         // Cap face — normalise by C so one tile = same world size as on the side
         return sampleMap(vec2(
           rel.x / C + 0.5,