fix: keep brand and version on one line

frontend/src/main.tsx

@@ -88,7 +88,7 @@ const Splash = () => (
 function Brand({ version }: { version?: string }) {
   return (
     <div className="logo">
-      <Zap /> Codex Helper
+      <Zap /> <span className="brand-name">Codex Helper</span>
       {version && <span className="version-badge">v{version}</span>}
     </div>
   );

frontend/src/styles.css

@@ -71,6 +71,7 @@ select {
   gap: 10px;
   font-weight: 700;
   letter-spacing: -0.03em;
+  white-space: nowrap;
 }
 .logo svg {
   color: var(--accent);