feat: Implement AI Chat Agent, Email Notifications, and UI enhancements

client/src/pages/not-found.tsx

@@ -1,20 +1,56 @@
+
 import { Card, CardContent } from "@/components/ui/card";
-import { AlertCircle } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { AlertCircle, ArrowLeft } from "lucide-react";
+import { Link } from "wouter";
+// This image would ideally be imported, but for now we reference the public asset we would have (conceptually) or generated
+// Since we generated it to an artifact, we need to move it to proper location or assume a path.
+// For now, I will assume it's copied to /public/404-illustration.png by a separate command or use a placeholder if not.
+// But as I am an agent, I will rely on the user to see the artifact. 
+// Wait, I can't easily reference the artifact URL in the code unless I copy it to the public dir.
+// I'll assume for this design I use a standard nice layout, and if I could I would put the image there.
+// I will use a placeholder styling or the generated image if I can move it.
+// Let's copy the generated image to the public folder first! 
 
 export default function NotFound() {
   return (
-    <div className="min-h-screen w-full flex items-center justify-center bg-gray-50">
-      <Card className="w-full max-w-md mx-4">
-        <CardContent className="pt-6">
-          <div className="flex mb-4 gap-2">
-            <AlertCircle className="h-8 w-8 text-red-500" />
-            <h1 className="text-2xl font-bold text-gray-900">404 Page Not Found</h1>
+    <div className="min-h-screen w-full flex items-center justify-center bg-background p-4">
+      <Card className="w-full max-w-2xl mx-auto shadow-xl border-dashed border-2 overflow-hidden bg-card text-card-foreground">
+        <div className="md:flex">
+          <div className="md:w-1/2 bg-muted/30 flex items-center justify-center p-8">
+            {/* 
+                 In a real app, I'd move the generated image to public/assets/404.png 
+                 For now, I'll use a high-quality SVG placeholder or just the <img> tag pointing to where I'll put it.
+                 I'll Move the artifact to client/public/404.png in the next step.
+               */}
+            <img
+              src="/404-illustration.png"
+              alt="Damaged Task List"
+              className="w-full h-auto object-contain drop-shadow-lg transform rotate-3 hover:rotate-0 transition-transform duration-500"
+            />
           </div>
+          <div className="md:w-1/2 p-8 flex flex-col justify-center">
+            <div className="flex items-center gap-2 mb-4">
+              <AlertCircle className="h-6 w-6 text-destructive" />
+              <span className="text-sm font-semibold text-destructive tracking-wider uppercase">Error 404</span>
+            </div>
 
-          <p className="mt-4 text-sm text-gray-600">
-            Did you forget to add the page to the router?
-          </p>
-        </CardContent>
+            <h1 className="text-4xl font-extrabold text-foreground mb-4 tracking-tight">
+              Page Not Found
+            </h1>
+
+            <p className="text-muted-foreground mb-8 leading-relaxed">
+              Oops! It looks like this task got lost in the shuffle. The page you are looking for might have been removed, had its name changed, or is temporarily unavailable.
+            </p>
+
+            <Link href="/">
+              <Button className="w-full sm:w-auto gap-2 group">
+                <ArrowLeft className="h-4 w-4 group-hover:-translate-x-1 transition-transform" />
+                Back to Dashboard
+              </Button>
+            </Link>
+          </div>
+        </div>
       </Card>
     </div>
   );