Make neighbor projection save-deferred and Visio-style connect.

Project-neighbors supports dry_run for local dirty canvas; Save flushes adds. Connect mode uses drag-from side anchors with smoothstep elbows instead of click-click.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/i18n/en.ts

@@ -1493,7 +1493,8 @@ const en = {
     snapGrid: "Snap to grid",
     autoLayoutDiscover: "Auto-layout after discover",
     discoverAutoAddUnmatched: "Auto-add unmatched NEs as placeholders on discover",
-    discoverProjectNeighbors: "After discover, project neighbors of scanned NEs onto the canvas",
+    discoverProjectNeighbors:
+      "After discover, project neighbors of scanned NEs onto the canvas (Save to keep permanently)",
     undo: "Undo",
     redo: "Redo",
     discoverSelected: "Discover selected ({{count}})",
@@ -1621,7 +1622,7 @@ const en = {
     removeStaleHint:
       "Queue delete of red missing edges (applies on Save); scheduled collect also purges after 4 consecutive misses",
     staleRemoved: "Queued {{count}} missing edge delete(s) — Save to apply",
-    connectHint: "Connect mode: click source node, then target (Esc or Select to exit)",
+    connectHint: "Connect mode: drag from a node's side anchors to the target NE (Esc or Select to exit)",
   },
   topoClassify: {
     title: "Classify & slices",

web/src/i18n/zh.ts

@@ -1484,7 +1484,7 @@ const zh = {
     snapGrid: "网格吸附",
     autoLayoutDiscover: "发现后自动布局",
     discoverAutoAddUnmatched: "发现时自动入库未匹配网元（占位）",
-    discoverProjectNeighbors: "发现后将本次扫描网元的直连邻居加入画布",
+    discoverProjectNeighbors: "发现后将本次扫描网元的直连邻居加入画布（需保存才永久保留）",
     undo: "撤销",
     redo: "重做",
     discoverSelected: "发现选中 ({{count}})",
@@ -1608,7 +1608,7 @@ const zh = {
     removeStale: "清除未发现 ({{count}})",
     removeStaleHint: "标记删除红色未发现链路（保存后生效）；周期采集连续 4 次未发现也会自动清理",
     staleRemoved: "已标记删除 {{count}} 条未发现链路（保存后生效）",
-    connectHint: "连线模式：依次点击源节点 → 目标节点（Esc 或切回选择退出）",
+    connectHint: "连线模式：从节点四边锚点拖到目标网元（Esc 或切回选择退出）",
   },
   topoClassify: {
     title: "分类与切片",