chore: upgrade svelte to v5

[maiertech]

Description of change

Upgrade:

• svelte to v5
• vite to v6
• @sveltejs/vite-plugin-svelte to v5

Refactoring:

• All svelte-check and lint errors resolved in preparation for ci: add svelte-check #184.
• Svelte 5 uses different types than Svelte 4. I use new type Component a lot. Component is backwards compatible with Svelte 4 components.
• Svelte 5 does not want self-closing tags. I added a couple of closing tags.
• No Svelte 4 to Svelte 5 conversion refactoring. Svelte 5 should be backwards compatible with Svelte 4.

Links to any relevant issues

• Fixes Upgrade Svelte to v5 #478.

How the change has been tested

Test the following flows with the desktop version. Even better if you can deploy UniMe to your phone. Flows to test:

• Set up a new profile.
• Go through https://ministerie-van-defensie.dev.impierce.com/ (minus 8vance).
• Check out one e-commerce demo, e.g. https://deonlinedrogist.co.nl/.

Explore as much as possible side paths, e.g. tap on a credential, tap on an issuer, tap on activity etc.

Definition of Done checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes