refactor: toast design

[crnkovic]

Summary

https://app.clickup.com/t/315h46e

Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my (code) changes for obvious issues, debug statements and commented code
• I provided a screenshot of my changes to the component (if applicable)
• I regenerated the icons.html file and checked if my newly added icon is shown correctly (if necessary)
• I added an explanation on how to use the component to the readme (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[ItsANameToo]

some remarks:

• can you update the mobile alert styling to match the toasts? those seem to be identical now in the styleguide, while alerts are currently using a smaller icon (14px instead of 16px)
• can you add the spinner handling to the usage guide so it's clear how to make it appear/hide when needed
• can the titles be made configurable like the alerts have? so we can set a custom title if needed instead of having Success for a success toast