fix: Block Editor在行尾输入空格会唤出AI对话框改成双击空格唤出AI对话框

frontend/src/core/features/block_editor/BlockEditorEntry.vue

@@ -659,12 +659,15 @@ const aiInputOverlayRef = ref<HTMLElement | null>(null)
 /** 是否为续写模式（行尾空格，非空段落） */
 const aiIsContinuation = ref(false)
 
-/** 空格键触发 AI 输入条 */
+// ── 双击空格 AI 触发 ────────────────────────────────────────────────────────
+/** 双击空格（300ms 内）触发 AI 输入条；单次空格正常插入字符 */
+let _lastSpaceTime = 0
+let _wasEmptyBeforeDblSpace = false
+const DBL_SPACE_TIMEOUT = 300
+
 function handleAISpaceTrigger(event: KeyboardEvent) {
   const editor = editorRef.value
   if (!editor || !editor.isEditable) return
-
-  // 检测：空格键（无修饰键）
   if (event.key !== ' ' || event.ctrlKey || event.metaKey || event.altKey) return
 
   const { $from } = editor.state.selection
@@ -672,16 +675,22 @@ function handleAISpaceTrigger(event: KeyboardEvent) {
 
   const isEmptyParagraph = $from.parent.content.size === 0
   const isAtEnd = $from.parentOffset >= $from.parent.content.size
-
-  // 只允许：空段落（从零生成）或光标在段落末尾（续写）
   if (!isEmptyParagraph && !isAtEnd) return
 
-  event.preventDefault()
+  const now = Date.now()
 
-  aiIsContinuation.value = !isEmptyParagraph
+  if (now - _lastSpaceTime < DBL_SPACE_TIMEOUT) {
+    // 300ms 内连续两次空格 → 触发 AI 对话框
+    event.preventDefault()
+    aiIsContinuation.value = !_wasEmptyBeforeDblSpace
+    showAskDialog.value = true
+    _lastSpaceTime = 0
+    return
+  }
 
-  // 统一使用 AskAIDialog
-  showAskDialog.value = true
+  // 第一次空格：记录状态，让空格正常插入
+  _lastSpaceTime = now
+  _wasEmptyBeforeDblSpace = isEmptyParagraph
 }
 
 /** 点击 AI 输入框外部时关闭 */