[BUG] CategoryFormModal silently fails on API error — no user feedback

[Siddh2024]

Description

When category creation or update fails in CategoryFormModal.jsx, the error is only logged to console.error with NO user-facing feedback whatsoever.

Impact

• Users think the category was saved but it actually failed silently
• Confusing UX — modal just stays open with no indication of success/failure

Files Involved

• RestroHub-FrontEnd/src/components/admin/menu/menuCard/CategoryFormModal.jsx