Client » PQS_Japan

This PR improves the user experience for "not found" and empty product list scenarios across the app:
404 Page Redesign:

• Replaces the default Next.js error page with a custom 404 page (Page404) featuring updated font sizes and styles.
• Adds a breadcrumb and clear navigation options ("Go to homepage" and "Contact us").
• Font adjustments for better readability on different screen sizes.

Unified NotFound Component:

• Introduces a reusable NotFound component (with icon) for empty product lists.
• Replaces previous inline "No products found" messages in all product section components (all-stock, home, korean-stock, stock-list, truck-stock) with the new NotFound component.
• Ensures consistent design and messaging when no products are available.

How to Test

404 Page:

• Visit any non-existent route (e.g., /random-url).
• Confirm the custom 404 page appears with correct fonts, breadcrumb, and navigation buttons.

Empty Product Lists:

• Use filters or search parameters that yield no results in any product section (e.g., All Stock, Home, Korean Stock, Stock List, Truck Stock).
• Confirm the new NotFound component displays with the icon, message, and "Go to homepage" button.

Responsiveness:

• Check both the 404 page and NotFound component on different screen sizes to verify font adjustments and layout.

Navigation:

• Test the "Go to homepage" and "Contact us" buttons to ensure they route correctly.

Note:
No business logic was changed—only UI/UX for not found states. All previous error handling should remain functional.