feat: add dismiss button for store call-to-action and style updates

index.html

@@ -74,7 +74,9 @@
         <canvas id="viewport"></canvas>
         <div id="brush-cursor"></div>
         <div id="store-cta-wrapper">
-          <span id="store-cta" data-i18n-html="cta.store">Support this tool? Shop at <a href="https://geni.us/CNCStoreTexture" target="_blank" rel="noopener noreferrer">CNCKitchen.STORE</a> or donate on <a href="https://www.paypal.me/CNCKitchen" target="_blank" rel="noopener noreferrer">PayPal</a></span>
+          <span id="store-cta">
+            <span data-i18n-html="cta.store">Support this tool? Shop at <a href="https://geni.us/CNCStoreTexture" target="_blank" rel="noopener noreferrer">CNCKitchen.STORE</a> or donate on <a href="https://www.paypal.me/CNCKitchen" target="_blank" rel="noopener noreferrer">PayPal</a></span><button id="store-cta-dismiss" aria-label="Dismiss">&times;</button>
+          </span>
         </div>
       </div>
       <div id="viewport-footer">

js/main.js

@@ -445,6 +445,11 @@ function wireEvents() {
     if (e.target === licenseOverlay) licenseOverlay.classList.add('hidden');
   });
 
+  // ── Support banner dismiss ──
+  document.getElementById('store-cta-dismiss').addEventListener('click', () => {
+    document.getElementById('store-cta-wrapper').classList.add('store-cta-hidden');
+  });
+
   // ── Export ──
   exportBtn.addEventListener('click', () => {
     if (sessionStorage.getItem('stlt-no-sponsor') === '1') {

style.css

@@ -258,6 +258,25 @@ main {
 #store-cta a:hover {
   opacity: 0.85;
 }
+#store-cta-dismiss {
+  background: none;
+  border: none;
+  color: #fff;
+  font-size: 11px;
+  line-height: 1;
+  cursor: pointer;
+  opacity: 0.7;
+  padding: 0 2px;
+  margin-left: 8px;
+  font-weight: bold;
+  vertical-align: top;
+  position: relative;
+  top: -4px;
+  transition: opacity 0.15s;
+}
+#store-cta-dismiss:hover {
+  opacity: 1;
+}
 .store-cta-hidden {
   display: none !important;
 }