Transactions History Edit/Update Update Report

What changed:
1. Added an Edit button beside each saved transaction.
2. Clicking Edit loads that transaction's saved data into the existing Add / Update Transaction Data form.
3. The form title changes to "Update Transaction Data".
4. The submit button changes from "Add Transaction" to "Update Transaction".
5. Added a Cancel Update button that returns the form to add mode.
6. Existing layout/look is preserved; the changes are inside the current section only.
7. No new database columns are required for this update.

How to use:
- Open /admin/transactions-history
- Click Edit beside any saved transaction
- Change fields in the form
- Click Update Transaction
- The existing row will be updated instead of creating a new one

Notes:
- Delete and Reset Transaction Verification remain available in the same admin/permission area.
- Normal users without show_menu permission will not see Add/Edit/Delete/Reset controls.