Issue #1138: Add Playwright E2E for context-menu → delete confirm flow.
The unit test (ContextMenu.keyboard.test.tsx) only exercises the store
setter — it can't catch the portal/race bug from PR #1133 where the
portal-rendered ConfirmDialog was closed by the menu's outside-click
handler before onConfirm fired.
This E2E test covers:
- Right-click workspace node → context menu opens
- Click Delete → ConfirmDialog appears (not swallowed)
- Click Confirm → dialog closes, node disappears, DELETE /workspaces/:id fires
- Click Cancel → dialog closes, node remains
Requires: platform on :8080, canvas on :3000.
Closes#1138.
Co-authored-by: Molecule AI Core-UIUX <core-uiux@agents.moleculesai.app>
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