Motivation:
Users faced data loss when navigating without saving, lacked visual feedback after saving, and the model dropdown logic was broken for the new LLM_CONFIG mode.
Implementation:
1. Replaced 'Custom/手动输入' with 'LLM_CONFIG (from input)' in nodeCreated event.
2. Added visual toast and temporary color change to 'Save' button.
3. Implemented hasUnsavedChanges() and canNavigateAway() pattern to warn users before discarding modified provider data.
科林_Cyril Pilgrim
74eefa17cf