WIP: migrate from webpack to vite for storybook

[maloky]

What are you doing in this PR?

Migrate bundler for storybook from web pack to Vite.

Trello Card

Why are you doing this?

Storybook v9 dropped support for webpack in preact projects, and before we upgrade to v9, we need to migrate to Vite.

How to test

How can we measure success?

Have we considered potential risks?

Accessibility test checklist

• [ ] Tested with screen reader
• [ ] Navigable with keyboard
• [ ] Colour contrast passed
• [ ] The change doesn't use only colour to convey meaning

Screenshots