Refactor PrimitiveNode asset widget code after PR #8594 merges #8744
Description
Background
This is a follow-up refactoring task for the asset widget support added in PR #8598.
Task
After PR #8594 is merged, review and refactor the PrimitiveNode asset widget code (specifically in src/extensions/core/widgetInputs.ts and related files) to simplify it if possible.
Dependencies
- Blocked by: feat: add WidgetValueStore for centralized widget value management #8594
- Original implementation: feat(cloud): add asset widget support for PrimitiveNode model selection #8598
Context
Requested by @christian-byrne in #8598
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