Clicking "Delete" in the workspace context menu did nothing for stuck
workspaces. The confirm dialog was rendered via portal as a child of
ContextMenu. ContextMenu's outside-click handler checks whether the
click target is inside its ref — but the portal puts the dialog in
document.body, outside the ref. So clicking the dialog's Confirm
counted as "outside", closed the menu, unmounted the dialog mid-click,
and the onConfirm handler never ran.
Hoist the pending-delete state to the canvas store and render the
confirm dialog at the Canvas level (same pattern as the existing
pendingNest dialog). The dialog now outlives ContextMenu, so the
outside-click close is harmless. Close the context menu on the Delete
click itself rather than waiting for the dialog to resolve.
Add a regression test covering the new flow and add the standard
?confirm=true query param so the backend's child-cascade guard is
consulted correctly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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