Bug: Can save requests with duplicate names in same collection

[AkashBhuiyan]

Description

Users can save multiple requests with identical names in a single collection, causing confusion.

Steps to Reproduce

1. Save request with name "Get Users" to collection
2. Save another request with same name "Get Users" to same collection
3. Both are saved without warning

Expected Behavior

• Warn if name already exists
• Option to overwrite or auto-rename (e.g., "Get Users (2)")

Labels

bug, validation