初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/ErrorBoundary.tsx

@@ -0,0 +1,33 @@
+import { Component, ErrorInfo, ReactNode } from 'react';
+import { Button } from '@/components/ui/button';
+
+interface Props { children: ReactNode }
+interface State { error: Error | null }
+
+/** 捕获渲染异常，避免整页白屏 */
+export default class ErrorBoundary extends Component<Props, State> {
+  state: State = { error: null };
+
+  static getDerivedStateFromError(error: Error) {
+    return { error };
+  }
+
+  componentDidCatch(error: Error, info: ErrorInfo) {
+    console.error('[Jiang13Forum]', error, info.componentStack);
+  }
+
+  render() {
+    if (this.state.error) {
+      return (
+        <div style={{ padding: 24, textAlign: 'center' }}>
+          <h3>页面渲染出错</h3>
+          <p style={{ color: 'var(--color-text-3)', fontSize: 13 }}>{this.state.error.message}</p>
+          <Button size="sm" onClick={() => { this.setState({ error: null }); window.location.reload(); }}>
+            刷新页面
+          </Button>
+        </div>
+      );
+    }
+    return this.props.children;
+  }
+}