fix(strategy-map): 三处缺陷——D1 完备度/摘要路由先注册(修 /completeness/objectives 422)、D2 连线增删显式 flag_modified(修 DELETE 200 不落库)、D3 拖拽命中改 rect 判定(修窄屏知识面板遮挡导致拖拽失效)

frontend/src/views/MapCanvas.vue

@@ -994,10 +994,21 @@ function onTreeDragStart(payload: { dimKey: string; index: number; obj: any }) {
 }
 function onTreeDragOver(e: DragEvent) {
   if (!treeDragSource.value) return
-  const el = document.elementFromPoint(e.clientX, e.clientY)?.closest('[data-node-key]') as HTMLElement | null
-  const key = el?.getAttribute('data-node-key') || null
+  // 命中判定改用节点 rect 包含判断：elementFromPoint 会被覆盖层（窄屏时的知识面板 .kp-panel、
+  // 连线 SVG 等）挡住 ⇒ 拖拽在窄屏下永远取不到目标节点。rect 判定与层级无关。
+  const key = hitTestNodeKey(e.clientX, e.clientY)
   dragConnectTarget.value = key && key !== treeDragSource.value.key ? key : null
 }
+function hitTestNodeKey(x: number, y: number): string | null {
+  const nodes = document.querySelectorAll('[data-node-key]') as NodeListOf<HTMLElement>
+  for (const el of Array.from(nodes)) {
+    const r = el.getBoundingClientRect()
+    if (r.width > 0 && r.height > 0 && x >= r.left && x <= r.right && y >= r.top && y <= r.bottom) {
+      return el.getAttribute('data-node-key')
+    }
+  }
+  return null
+}
 function onTreeDragLeave(e: DragEvent) {
   const related = (e as any).relatedTarget as Node | null
   const box = scrollWrapRef.value