- Add '批量添加到画布' panel in the right-side assets panel, with
全选可添加 toggle and '添加到画布 (N)' action button.
- Add per-card '加画布 / 已选' toggle button (left of download icon),
visible when task.status is success. Selected cards show yellow ring.
- Wire selectedAddTaskIds Set state, addableTasks/selectedAddTasks memos,
handleToggleAddSelection / handleSelectAllForAdd / handleBatchImportToCanvas
handlers, and a useEffect to prune stale selections when visible
history changes.
- handleBatchImportToCanvas calls addNodesBulk (added in 3ca5859) which
loops addNode and reuses its ring-scan auto-overlap logic, so multiple
world3d/model3d nodes land at distinct canvas positions instead of
stacking on the viewport center.
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