feat(web): 前端共享基础(focusRing/proseBody/text-2xs + useBodyScrollLock + Toast撤销 + error/not-found/loading路由边界)

apps/web/app/error.tsx

@@ -0,0 +1,37 @@
+"use client";
+
+import Link from "next/link";
+import { TriangleAlert } from "lucide-react";
+
+import { EmptyState } from "@/components/ui/EmptyState";
+import { Button } from "@/components/ui/Button";
+import { buttonClass } from "@/lib/ui/variants";
+
+interface ErrorBoundaryProps {
+  error: Error & { digest?: string };
+  reset: () => void;
+}
+
+export default function Error({ reset }: ErrorBoundaryProps) {
+  return (
+    <main className="flex min-h-screen items-center justify-center bg-bg px-6 py-16">
+      <div className="w-full max-w-md">
+        <EmptyState
+          icon={TriangleAlert}
+          title="出错了"
+          description="刚才的操作没能完成。可以重试，或先回到作品库。"
+          action={
+            <div className="flex items-center justify-center gap-2">
+              <Button variant="primary" onClick={reset}>
+                重试
+              </Button>
+              <Link href="/" className={buttonClass({ variant: "secondary" })}>
+                返回作品库
+              </Link>
+            </div>
+          }
+        />
+      </div>
+    </main>
+  );
+}