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feat(canvas): 删节点、删连线、拖卡换泳道可撤销，撤销卡撤的是卡上那一步（第二批 W3 · undo-adopt-existing） - #322
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- 新增 models/commands/：DeleteNodesCommand（restoreAll 一次复原，0 行 ⇒ gone，含导入节点时重载节点控制器； 重做换新令牌）、DeleteEdgeCommand（按两端 + 类型找边，同两端已有在世边视为已复原）、 MoveNodesCommand + MoveNodesLabel（位移按目标 − 此刻位置算，一次 moveNodes） - 新增 util/canvas_edge_delete.dart 的 deleteEdgeWithUndo：舞台选中线的 ✕ 与检查器入边区「移除」共用， 检查器移除失败不再吞掉 - canvas_node_delete：成功即 record + 按步出卡，不再以 context.mounted 为前提；删掉 _restore / _restoreAll - canvas_snackbars：showCanvasUndoSnack 增加按步用法（canvasId + stepId），新增不依赖 context 的 showCanvasUndoSnackWith（卡上「撤销」= runCanvasUndoStep，卡绑到步上随步收起）；showUndoToast 原样保留 - node_card_slot：换道成功后 record MoveNodesCommand 并按步出卡，删掉闭包撤销 - 测试：三个命令测试、删节点撤销栈用例、换道 Ctrl Z、撤销卡按步 / 收卡、检查器移除失败；canvas_view_test 只改 fake Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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删节点（单删 / 多删）、删连线、拖卡换泳道，现在都记进画布撤销栈：Ctrl Z / ⌘Z 能撤，撤销卡上的「撤销」撤的是卡上那一步（不是栈顶），关掉画布后残留的卡点了不再生效。
改了什么
models/commands/：DeleteNodesCommand（复原 = restoreAll，返回 0 ⇒ 这一步作废；复原里含导入节点时让节点控制器重载）、DeleteEdgeCommand（按两端找边，同两端已有在世边 ⇒ 不重复复原）、MoveNodesCommand（回到原位置与原泳道；步名存泳道原名，显示时才落成「未命名」）。util/canvas_edge_delete.dart：deleteEdgeWithUndo，舞台连线删除键与检查器输入行「移除」共用；context / ref 在第一次 await 前取齐。检查器「移除」失败现在会出错误卡（以前静默吞掉）。canvas_snackbars.dart：新增showCanvasUndoSnackWith（按步撤 + 绑卡，步被撤掉 / 画布关闭 ⇒ 卡收起）；showCanvasUndoSnack保留两种用法（按步登记 / 只给 onUndo 回调）。泳道解散 / 删除仍走showUndoToast，不变。已知、不在本 PR 修
验证（最终 head）
flutter analyze lib test：No issues foundflutter test -j 4 --exclude-tags golden：4017 全绿🤖 Generated with Claude Code