style: use external logo URL and maintain navy theme

src/components/TopBar.tsx

@@ -15,7 +15,7 @@ export function TopBar({ stats, onExport, hasData, hasUnsavedChanges, userEmail,
     <header className="bg-[#020812] border-b border-slate-700/30 h-16 flex items-center justify-between px-6 shrink-0 z-10 shadow-2xl">
       <div className="flex items-center">
         <img 
-          src="/assets/logo.png" 
+          src="https://i.ibb.co/9m7m81gJ/Gemini-Generated-Image-my35f7my35f7my35.png" 
           alt="DataCraze" 
           className="h-10 w-auto object-contain"
         />