Fixes an issue where column width changes and other view field
modifications were not persisted, and a toast error was shown.
**Root Causes:**
1. Frontend was using client-generated IDs instead of database IDs for
updates
2. Backend cache was stale, causing `View field to update not found`
error
**Changes:**
- Use the existing database ID when updating view fields
- Exclude client-generated IDs when creating new view fields
- Invalidate flat entity maps cache before/after view field operations
- Refresh both view and view field caches to prevent validation errors
Fixes#16417Closes#16381
Rajdeep Das
a4daead678