feat(dashboards): add error and not-found pages for admin and tracker dashboards

dashboards/admin-web/src/app/error.tsx

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+'use client';
+
+import { useEffect } from 'react';
+
+export default function GlobalError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  useEffect(() => {
+    // TODO: send to telemetry once wired
+  }, [error]);
+
+  return (
+    <div className="flex min-h-screen items-center justify-center p-4">
+      <div className="mx-auto max-w-md text-center">
+        <div className="mb-4 text-5xl">⚠</div>
+        <h2 className="mb-2 text-xl font-semibold">Something went wrong</h2>
+        <p className="mb-6 text-sm text-muted-foreground">
+          {error.message || 'An unexpected error occurred.'}
+        </p>
+        <button
+          onClick={reset}
+          className="rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground hover:bg-primary/90"
+        >
+          Try again
+        </button>
+      </div>
+    </div>
+  );
+}

dashboards/admin-web/src/app/not-found.tsx

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+import Link from 'next/link';
+
+export default function NotFound() {
+  return (
+    <div className="flex min-h-screen items-center justify-center p-4">
+      <div className="mx-auto max-w-md text-center">
+        <div className="mb-4 text-6xl font-bold text-muted-foreground">404</div>
+        <h2 className="mb-2 text-xl font-semibold">Page not found</h2>
+        <p className="mb-6 text-sm text-muted-foreground">
+          The page you&apos;re looking for doesn&apos;t exist or has been moved.
+        </p>
+        <Link
+          href="/"
+          className="rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground hover:bg-primary/90"
+        >
+          Go to Dashboard
+        </Link>
+      </div>
+    </div>
+  );
+}

dashboards/tracker-web/src/app/error.tsx

@@ -0,0 +1,33 @@
+'use client';
+
+import { useEffect } from 'react';
+
+export default function GlobalError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  useEffect(() => {
+    // TODO: send to telemetry once wired
+  }, [error]);
+
+  return (
+    <div className="flex min-h-screen items-center justify-center p-4">
+      <div className="mx-auto max-w-md text-center">
+        <div className="mb-4 text-5xl">⚠</div>
+        <h2 className="mb-2 text-xl font-semibold">Something went wrong</h2>
+        <p className="mb-6 text-sm text-muted-foreground">
+          {error.message || 'An unexpected error occurred.'}
+        </p>
+        <button
+          onClick={reset}
+          className="rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground hover:bg-primary/90"
+        >
+          Try again
+        </button>
+      </div>
+    </div>
+  );
+}

dashboards/tracker-web/src/app/not-found.tsx

@@ -0,0 +1,21 @@
+import Link from 'next/link';
+
+export default function NotFound() {
+  return (
+    <div className="flex min-h-screen items-center justify-center p-4">
+      <div className="mx-auto max-w-md text-center">
+        <div className="mb-4 text-6xl font-bold text-muted-foreground">404</div>
+        <h2 className="mb-2 text-xl font-semibold">Page not found</h2>
+        <p className="mb-6 text-sm text-muted-foreground">
+          The page you&apos;re looking for doesn&apos;t exist or has been moved.
+        </p>
+        <Link
+          href="/"
+          className="rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground hover:bg-primary/90"
+        >
+          Go Home
+        </Link>
+      </div>
+    </div>
+  );
+}