Loan saved with invalid date range

[IbrahimElhomsany1]

Title: Loan saved with return date earlier than loan date

Description:
System allows creating a loan where the return date is before the loan date, leading to invalid loan periods.

Steps to Reproduce:

1. Go to the “Create Loan” page.
2. Set the Loan Date to a later date.
3. Set the Return Date to an earlier date than the Loan Date and click Save.

Expected Result:
Validation error shown and loan is not saved.

Actual Result:
Loan is saved successfully with an invalid (negative) duration.
Severity: Medium
Priority: P2

Status: New

Environment: Chrome 129, Windows 11

Screenshot / Evidence: