Updated UI, webhook improvements, and location creation bug fixes

Improvements

• The Settings page UI has been updated for a cleaner and more user-friendly look.

• The Zapiet logo has been updated across all pages for a more consistent look.

• Webhooks have been optimised for smoother performance, and extra-long store names are now fully supported.

Bug fixes

• Previously, it was possible to create a new location without completing the required fields. This has been fixed, and all details must now be filled in before a location can be created.