feat(cma): strategy map lane KR delete entry (cma-map-kr-delete-entry-20260916)

- MapNode.vue: hover trash icon per KR row emitting delete-kr (inline SVG, no emoji)

- StrategyLayer.vue / MapCanvas.vue: passthrough + MyDialog second confirm + okrApi.deleteKr + whole-map save

- MapsDialog: single-KR policy hint (keep at least 1 KR per objective)

frontend/src/views/MapCanvas.vue

@@ -89,6 +89,7 @@
             @node-click="(dk: string, oi: number, obj: any) => onNodeClick(dk, oi, obj)"
             @reorder="(dk: string) => onLayerReorder(dk)"
             @edit-kr="(p: any) => onEditKr(p.dimKey, p.idx, p.obj, p.ki, p.kr)"
+            @delete-kr="(p: any) => onDeleteKr(p.dimKey, p.idx, p.obj, p.ki, p.kr)"
             @add-kr="(p: any) => onAddKr(p.dimKey, p.idx, p.obj)"
           />
 
@@ -167,6 +168,20 @@
       @delete-connection="onManagerDeleteConnection"
       @update-connection="onManagerUpdateConnection"
     />
+
+    <!-- KR 删除二次确认（2026-09-16）：项目统一弹窗组件 MyDialog（el-dialog 有历史 bug） -->
+    <MyDialog v-model="showKrDeleteConfirm" title="删除关键结果" :width="420">
+      <div class="kr-del-confirm-text">
+        确定删除关键结果「<strong>{{ krDeleteTarget?.name }}</strong>」？
+      </div>
+      <div class="kr-del-confirm-hint">
+        删除后该 KR 会从目标中移除，并同步删除 krs 表中对应记录（不可撤销）。
+      </div>
+      <template #footer>
+        <el-button size="small" @click="cancelDeleteKr">取消</el-button>
+        <el-button size="small" type="danger" :loading="krDeleting" @click="confirmDeleteKr">删除</el-button>
+      </template>
+    </MyDialog>
   </div>
   <!-- P1-3: 关联知识点 -->
   <div style="margin-top:12px;">
@@ -189,6 +204,7 @@ import ConnectionLines from "../components/strategy/ConnectionLines.vue"
 import MapCanvasToolbar from "../components/map-canvas/MapCanvasToolbar.vue"
 import MapCanvasDialogs from "../components/map-canvas/MapCanvasDialogs.vue"
 import ConnectionManagerDialog from "../components/map-canvas/ConnectionManagerDialog.vue"
+import MyDialog from "../components/MyDialog.vue"
 import html2canvas from "html2canvas"
 
 // ── 四层泳道配置 ──
@@ -966,6 +982,67 @@ function onAddKr(dimKey: string, oi: number, obj: any) {
   debouncedSaveCanvas()
 }
 
+// ── KR 删除（2026-09-16：泳道内删除入口，补齐「目标展开后没有删除图标」缺口） ──
+const showKrDeleteConfirm = ref(false)
+const krDeleting = ref(false)
+const krDeleteTarget = ref<{ dimKey: string; oi: number; ki: number; name: string } | null>(null)
+
+/**
+ * KR 删除入口：单条时不允许删到 0（口径见 _reports/cma-map-kr-delete-entry-20260916-return.md）
+ * 依据：① 后端 maps.py `_sync_objectives_krs` 在目标 krs 为空时 `continue`（跳过同步），
+ * 删到 0 不会传播到 krs 表 → 残留孤儿行；② 无 KR 的目标无法度量达成率。
+ * 单条 KR 时按钮仍然显示（可发现），点击给出明确提示，避免"图标消失=功能缺失"的观感。
+ */
+function onDeleteKr(dimKey: string, oi: number, obj: any, ki: number, kr: any) {
+  const dim = dimensions.find((d: any) => d.key === dimKey)
+  const target = dim?.objectives?.[oi]
+  const list: any[] = target?.krs || []
+  if (!target || ki < 0 || ki >= list.length) return
+  if (list.length <= 1) {
+    ElMessage.warning('每个目标至少保留 1 条关键结果；如需替换请先添加新的 KR')
+    return
+  }
+  krDeleteTarget.value = { dimKey, oi, ki, name: kr?.name || `KR ${ki + 1}` }
+  showKrDeleteConfirm.value = true
+}
+
+function cancelDeleteKr() {
+  showKrDeleteConfirm.value = false
+  krDeleteTarget.value = null
+}
+
+async function confirmDeleteKr() {
+  const t = krDeleteTarget.value
+  if (!t || krDeleting.value) return
+  const dim = dimensions.find((d: any) => d.key === t.dimKey)
+  const target = dim?.objectives?.[t.oi]
+  const kr = target?.krs?.[t.ki]
+  if (!target || !kr) { cancelDeleteKr(); return }
+  krDeleting.value = true
+  // 落库 id：_objective_id 由地图保存时后端回写；_kr_id 由 KR 同步/地图保存时回写
+  const objectiveId: number | null = target._objective_id || null
+  const krId: number | null = kr._kr_id || kr.id || null
+  const removedName = kr.name || `KR ${t.ki + 1}`
+  // 1) 本地移除（界面即时无残留）
+  target.krs.splice(t.ki, 1)
+  cancelDeleteKr()
+  try {
+    if (objectiveId && krId) {
+      // 2) 精确删除 krs 表对应行
+      await okrApi.deleteKr(objectiveId, krId)
+    }
+    // 3) 地图 JSON 为权威：整体保存（服务端 _sync_objectives_krs 亦会清理标题不在 JSON 中的 KR 行）
+    if (isSaving) await new Promise(r => setTimeout(r, 600))
+    await saveCanvas(true)
+    ElMessage.success(`关键结果「${removedName}」已删除`)
+  } catch (e: any) {
+    ElMessage.error(`删除失败：${e?.response?.data?.detail || e?.message || '未知错误'}`)
+  } finally {
+    krDeleting.value = false
+  }
+  nextTick(triggerRecalc)
+}
+
 // ── 数据迁移：旧格式 kpis[] 自动转为 krs[] ──
 function migrateOldKpiFormat() {
   for (const dim of dimensions) {
@@ -1373,4 +1450,21 @@ onUnmounted(() => {
   opacity: 0.5;
   pointer-events: none;
 }
+
+/* ── KR 删除确认（MyDialog 内容样式，2026-09-16） ── */
+.kr-del-confirm-text {
+  font-size: 14px;
+  color: #303133;
+  line-height: 1.6;
+}
+.kr-del-confirm-text strong {
+  color: #f56c6c;
+  word-break: break-all;
+}
+.kr-del-confirm-hint {
+  margin-top: 8px;
+  font-size: 12px;
+  color: #909399;
+  line-height: 1.5;
+}
 </style>