fix(exams): fix toolbar tracking and prevent list-to-options for non-choice questions

Two fixes:

1. Selection toolbar tracking: add pointerup listener so the toolbar
   updates its position immediately after the user finishes dragging
   the selection, not just on selectionUpdate events which can lag.

2. List-to-options conversion: parseOptions now only converts
   orderedList/bulletList to A/B/C options for choice question types
   (single_choice, multiple_choice, judgment). For text/composite
   questions, list content is preserved as part of the question stem
   text, preventing unwanted 'A.' prefixes.

src/modules/exams/editor/editor-to-structure.ts

@@ -51,9 +51,15 @@ const collectImages = (
   return imgs
 }
 
+/** 选择题类型:只有这些类型才会把列表解析为选项 */
+const CHOICE_TYPES = new Set(["single_choice", "multiple_choice", "judgment"])
+
 const parseOptions = (
-  nodes: JSONContent[]
+  nodes: JSONContent[],
+  questionType: RichQuestionType
 ): Array<{ id: string; text: string; isCorrect?: boolean }> => {
+  // 只有选择题才解析选项,填空/简答/复合题的列表保持为普通文本
+  if (!CHOICE_TYPES.has(questionType)) return []
   const options: Array<{ id: string; text: string; isCorrect?: boolean }> = []
   const seenIds = new Set<string>()
   for (const n of nodes) {
@@ -106,16 +112,19 @@ const buildQuestion = (qb: JSONContent): EditorQuestion => {
     return true
   })
 
-  const text = extractText({
+  // 选择题:过滤掉列表(列表作为选项单独处理)
-    type: "doc",
+  // 非选择题:保留列表内容在文本中(列表是题干的一部分)
-    content: nonQuestionBlocks.filter(
+  const isChoice = CHOICE_TYPES.has(type)
+  const textNodes = isChoice
+    ? nonQuestionBlocks.filter(
         (n) =>
           n.type !== "orderedList" &&
           n.type !== "bulletList" &&
           n.type !== "image"
-    ),
+      )
-  })
+    : nonQuestionBlocks.filter((n) => n.type !== "image")
-  const options = parseOptions(nonQuestionBlocks)
+  const text = extractText({ type: "doc", content: textNodes })
+  const options = parseOptions(nonQuestionBlocks, type)
   const blanks = collectBlanks(nonQuestionBlocks)
   const images = collectImages(nonQuestionBlocks)
   const content: RichQuestionContent = { text: text.trim() }

src/modules/exams/editor/selection-toolbar.tsx

@@ -128,6 +128,14 @@ export function SelectionToolbar({
     }
 
     editor.on("selectionUpdate", updatePosition)
+
+    // 鼠标释放后立即更新位置(选区拖动结束时)
+    const handlePointerUp = () => {
+      // 微延迟确保选区已更新
+      requestAnimationFrame(updatePosition)
+    }
+    document.addEventListener("pointerup", handlePointerUp)
+
     editor.on("blur", () => {
       // 延迟以允许点击工具栏按钮
       setTimeout(() => {
@@ -140,6 +148,7 @@ export function SelectionToolbar({
 
     return () => {
       editor.off("selectionUpdate", updatePosition)
+      document.removeEventListener("pointerup", handlePointerUp)
     }
   }, [editor])