feat(dash): honeycomb favicon + flame-free CodeBurn wordmark

Drop the flame image from the header and render CodeBurn as a plain
wordmark with an orange metallic sheen. Swap the favicon to the
honeycomb logo.

dash/src/App.tsx

@@ -429,10 +429,7 @@ export function App() {
       <div className="flex h-[calc(100vh-20px)] flex-col gap-2.5">
         <header className="flex h-12 shrink-0 items-center gap-4 rounded-md border border-border bg-card px-5 shadow-[0_2px_8px_rgba(0,0,0,0.03)]">
           <div className="flex items-center gap-2">
-            <img src="/codeburn-logo.png" alt="CodeBurn" className="h-6 w-6" />
-            <span className="text-lg font-semibold tracking-[-0.02em] text-foreground">
-              Code<span className="text-[#e8553a]">Burn</span>
-            </span>
+            <span className="cb-sheen text-lg font-semibold tracking-[-0.02em]">CodeBurn</span>
             <span className="ml-1 text-[11px] font-light uppercase tracking-[0.14em] text-tertiary-foreground">usage</span>
           </div>
 

dash/src/index.css

@@ -126,6 +126,20 @@
   0% { background-position: 200% 0; }
   100% { background-position: -200% 0; }
 }
+
+/* CodeBurn wordmark: orange metallic sheen (replaces the flame logo) */
+@keyframes cb-sheen {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+.cb-sheen {
+  background: linear-gradient(100deg, #c2432a 0%, #e8553a 32%, #ffcf9e 50%, #e8553a 68%, #c2432a 100%);
+  background-size: 220% 100%;
+  -webkit-background-clip: text;
+  background-clip: text;
+  color: transparent;
+  animation: cb-sheen 4s linear infinite;
+}
 .skeleton-shimmer {
   background-color: var(--muted);
   background-image: linear-gradient(