fix: resolve Next.js rendering errors, hook unhandled fetch error, theme logo layout, double header, and FastAPI multipart dependency

src/app/dashboard/page.tsx

@@ -28,11 +28,7 @@ export default function DashboardPage() {
 
   return (
     <div className="p-8 max-w-6xl mx-auto space-y-10 animate-in fade-in duration-500 slide-in-from-bottom-4">
-      <header className="flex flex-col md:flex-row md:items-center justify-between gap-4">
-        <div>
-          <h1 className="text-3xl font-bold tracking-tight">Welcome back, Demo Student</h1>
-          <p className="text-muted-foreground mt-1 font-medium">Let's keep up the momentum for JEE Advanced 2027.</p>
-        </div>
+      <header className="flex justify-end mb-2">
         <Button size="lg" className="gap-2 shadow-sm bg-[#00F0FF] text-background hover:bg-[#00F0FF]/90 font-bold">
           <BrainCircuit size={18} />
           Generate AI Plan