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e9ac55af59
Adds regression tests demonstrating that V3 DynamicCombo widget
serialization breaks when nodes are packed into subgraphs. The
serializeValue callback is lost during subgraph conversion, causing
sampling_mode to serialize as the raw string 'on' instead of the
expected {sampling_mode: 'on', temperature: 0.7, top_k: 64} object.
This reproduces the bug where TextGenerateLTX2Prompt -> PreviewAny
text preview fails inside subgraphs.
Tests:
- Unit: graphToPrompt DynamicCombo serialization at top level (pass)
and inside subgraph (intentional fail)
- E2E: DynamicCombo text preview at top level and inside subgraph
- Devtools: Mock V3 DynamicCombo node for CI testing (no model needed)