feat(lesson-preparation): v3 锚点失效提示 banner

src/modules/lesson-preparation/components/anchor-migration-banner.tsx

@@ -0,0 +1,73 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import { useTranslations } from "next-intl";
+import { useLessonPlanEditor } from "../hooks/use-lesson-plan-editor";
+
+/**
+ * V4：v3 锚点失效提示 banner。
+ * 当文档含旧锚点（invalid: true 或含 start/end 字段）且未 dismiss 时显示。
+ * dismiss 状态记录到 localStorage（按 planId）。
+ */
+export function AnchorMigrationBanner() {
+  const t = useTranslations("lessonPreparation");
+  const doc = useLessonPlanEditor((s) => s.doc);
+  const planId = useLessonPlanEditor((s) => s.planId);
+  const [dismissed, setDismissed] = useState(false);
+
+  useEffect(() => {
+    if (planId) {
+      const stored = localStorage.getItem(`lp-legacy-anchor-dismissed-${planId}`);
+      setDismissed(stored === "true");
+    } else {
+      setDismissed(false);
+    }
+  }, [planId]);
+
+  // 检测是否有旧锚点（invalid: true 或含 start/end 字段）
+  const hasLegacyAnchors = doc.anchors.some(
+    (a) => a.invalid === true || a.start !== undefined,
+  );
+
+  if (!hasLegacyAnchors || dismissed) return null;
+
+  const onDismiss = () => {
+    setDismissed(true);
+    if (planId) {
+      localStorage.setItem(`lp-legacy-anchor-dismissed-${planId}`, "true");
+    }
+  };
+
+  return (
+    <div
+      style={{
+        background: "#fef3c7",
+        borderBottom: "1px solid #fcd34d",
+        padding: "8px 20px",
+        display: "flex",
+        alignItems: "center",
+        gap: 12,
+        fontSize: 12.5,
+        color: "#92400e",
+      }}
+    >
+      <strong style={{ fontWeight: 600 }}>{t("v4.migration.legacyAnchorTitle")}</strong>
+      <span style={{ flex: 1 }}>{t("v4.migration.legacyAnchorBody")}</span>
+      <button
+        type="button"
+        onClick={onDismiss}
+        style={{
+          background: "transparent",
+          border: "1px solid #fcd34d",
+          borderRadius: 3,
+          padding: "3px 10px",
+          fontSize: 11,
+          color: "#92400e",
+          cursor: "pointer",
+        }}
+      >
+        {t("v4.migration.legacyAnchorDismiss")}
+      </button>
+    </div>
+  );
+}