fix: avoid map refresh on road selection

.trellis/tasks/08-26-workbench-selection-save-fix/check.jsonl

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+{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}

.trellis/tasks/08-26-workbench-selection-save-fix/implement.jsonl

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+{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}

.trellis/tasks/08-26-workbench-selection-save-fix/prd.md

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+# 修复工作台选择与保存回归
+
+## Goal
+
+道路选择只更新选择高亮，不重置地图数据或视图；保存修改后可靠保留并重新编译 overrides。
+
+## Confirmed Cause
+
+`MapCanvas` 使用 `[state, selected]` 更新全量 source 和 fit view，选择道路会触发全图重载。Road override 的前后端 schema 一致，因此保存回归需在 UI 操作后验证其状态同步和编译调用。
+
+## Acceptance Criteria
+
+- 选择道路不会清空 source、重新 fit 地图或改变视图。
+- 仅选择高亮 layer 更新；选择相关 OSM 线条样式仍刷新。
+- 暂存、保存、重新编译的 overrides 正确发送并以服务端响应更新状态。
+- 格式化、类型检查和构建通过。

.trellis/tasks/08-26-workbench-selection-save-fix/task.json

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+{
+  "id": "workbench-selection-save-fix",
+  "name": "workbench-selection-save-fix",
+  "title": "修复工作台选择与保存回归",
+  "description": "修复道路选择触发全图层重建，并排查修复 React 工作台保存 overrides 回归",
+  "status": "in_progress",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "dingkang",
+  "assignee": "dingkang",
+  "createdAt": "2026-08-26",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}