feat(slark): collapse onboarding to 1.5 steps

.cursor/hooks.json

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+{
+  "version": 1,
+  "hooks": {
+    "afterAgentResponse": [
+      {
+        "command": ".cursor/hooks/say-complete.sh"
+      }
+    ]
+  }
+}

.cursor/hooks/say-complete.sh

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+#!/bin/bash
+
+# Read and discard hook payload from stdin.
+cat >/dev/null
+
+if command -v say >/dev/null 2>&1; then
+  say "已完成" >/dev/null 2>&1 &
+fi
+
+printf '{}\n'

apps/demo/src/app/app-error-boundary.tsx

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+import { Component, type ErrorInfo, type ReactNode } from "react";
+
+type Props = { children: ReactNode };
+
+type State = { error: Error | null };
+
+export class AppErrorBoundary extends Component<Props, State> {
+  state: State = { error: null };
+
+  static getDerivedStateFromError(error: Error): State {
+    return { error };
+  }
+
+  componentDidCatch(error: Error, info: ErrorInfo) {
+    console.error("Demo app error:", error, info.componentStack);
+  }
+
+  render() {
+    if (this.state.error) {
+      return (
+        <div
+          style={{
+            padding: 24,
+            fontFamily: "system-ui, sans-serif",
+            maxWidth: 720,
+          }}
+        >
+          <h1 style={{ fontSize: 20, marginBottom: 12 }}>页面加载出错</h1>
+          <p style={{ color: "#666", marginBottom: 16 }}>
+            请打开开发者工具（Console）查看完整堆栈，或把下方错误信息发给开发者。
+          </p>
+          <pre
+            style={{
+              whiteSpace: "pre-wrap",
+              wordBreak: "break-word",
+              background: "#f5f5f5",
+              padding: 12,
+              borderRadius: 8,
+              fontSize: 13,
+            }}
+          >
+            {this.state.error.message}
+          </pre>
+        </div>
+      );
+    }
+    return this.props.children;
+  }
+}