Update chat button

UI/index.html

@@ -47,7 +47,7 @@
                     </button>
                 </div>
                 <button class="btn btn-chat-toggle" id="btn-chat-toggle" title="AI Chat Helper">
-                    🌱
+                    🪏
                 </button>
                 <div class="run-dropdown">
                     <button class="btn btn-primary ide-run-btn" onclick="runCode()">

UI/style.pixel.css

@@ -2087,12 +2087,12 @@ img, canvas{ image-rendering: pixelated; }
 
 .btn-chat-toggle {
   font-family: var(--pixel-font);
-  font-size: 9px;
+  font-size: 11px;
   background: linear-gradient(180deg, #2a5a35, #1e4228);
   color: var(--accent);
   border: 1px solid rgba(124,210,111,.4);
   border-radius: 6px;
-  padding: 6px 14px;
+  padding: 6px 28px;
   cursor: pointer;
   transition: all .2s ease;
   white-space: nowrap;