Problem: Adding a group row then typing in cells caused continuous reset
Root Cause: Vue reactivity lost when assigning new array to reactive object
Solution: Use Object.assign() to maintain reactivity tracking
- Changed: mockChildCodesMap[key] = list
- To: Object.assign(mockChildCodesMap, { [key]: list })
- Result: Cell input now persists without reset
Affects: /system/common-codes grid editing
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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