## Summary
Fix multiple issues with promoted widget resolution in nested subgraphs,
ensuring correct value propagation, slot matching, and rendering for
deeply nested promoted widgets.
## Changes
- **What**: Stabilize nested subgraph promoted widget resolution chain
- Use deep source keys for promoted widget values in Vue rendering mode
- Resolve effective widget options from the source widget instead of the
promoted view
- Stabilize slot resolution for nested promoted widgets
- Preserve combo value rendering for promoted subgraph widgets
- Prevent subgraph definition deletion while other nodes still reference
the same type
- Clean up unused exported resolution types
## Review Focus
- `resolveConcretePromotedWidget.ts` — new recursive resolution logic
for deeply nested promoted widgets
- `useGraphNodeManager.ts` — option extraction now uses
`effectiveWidget` for promoted widgets
- `SubgraphNode.ts` — unpack no longer force-deletes definitions
referenced by other nodes
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9282-fix-stabilize-nested-subgraph-promoted-widget-resolution-3146d73d365081208a4fe931bb7569cf)
by [Unito](https://www.unito.io)
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Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>
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