[backport cloud/1.40] fix: stabilize nested subgraph promoted widget resolution

[DrJKL]

Description

Backport of #9282 (fix: stabilize nested subgraph promoted widget resolution) to cloud/1.40, including its prerequisite #8856 (feat: synthetic widgets getter for SubgraphNode, proxy-widget-v2).

Cherry-picked PRs (in order)

1. fix: update imagePreview browser tests to use current fixture APIs #8995 (3e4d27383) — fix: update imagePreview browser tests to use current fixture APIs
2. feat: synthetic widgets getter for SubgraphNode (proxy-widget-v2) #8856 (c25f9a0e9) — feat: synthetic widgets getter for SubgraphNode (proxy-widget-v2)
3. fix: stabilize nested subgraph promoted widget resolution #9282 (dd1a1f77d) — fix: stabilize nested subgraph promoted widget resolution

Backport adjustments

• Added svgBitmapCache.ts from fix: pre-rasterize SubgraphNode SVG icon to bitmap canvas #9172 (intermediate dependency not on cloud/1.40)
• Updated drawImage call to use workflowBitmapCache (from fix: pre-rasterize SubgraphNode SVG icon to bitmap canvas #9172)
• Fixed getWidget 3-arg signature in domWidget.ts and domWidgetStore.test.ts (cloud/1.40 had 2-arg version)
• Removed unconditional subgraphs.delete in unpackSubgraph (duplicated by remove() guard logic)
• Resolved conflicts in SubgraphBreadcrumb.vue, domWidget.ts, useGraphNodeManager.ts, LGraph.ts, LGraph.test.ts, SubgraphNode.ts
• Regenerated pnpm-lock.yaml

Verification

• pnpm typecheck ✅
• pnpm test:unit ✅ (all 5126 tests pass; 1 pre-existing flaky perf test excluded)

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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	vite@​8.0.0-beta.13

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Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm vite is 91.0% likely obfuscated Confidence: 0.91 Location: Package overview From: apps/desktop-ui/package.json → npm/vite@8.0.0-beta.13 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/vite@8.0.0-beta.13. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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Playwright: ❌ 552 passed, 1 failed · 2 flaky

❌ Failed Tests

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• chromium: View Report (✅ 539 / ❌ 1 / ⚠️ 2 / ⏭️ 10)
• chromium-2x: View Report (✅ 2 / ❌ 0 / ⚠️ 0 / ⏭️ 0)
• chromium-0.5x: View Report (✅ 1 / ❌ 0 / ⚠️ 0 / ⏭️ 0)
• mobile-chrome: View Report (✅ 10 / ❌ 0 / ⚠️ 0 / ⏭️ 0)

[github-actions]

Updating Playwright Expectations