Migrated user interface to Svelte 5

[gskjold]

Dependabot have been bugging us about this for a while, but since we used the deprecated svelte-navigator dependency, this had to be replaced by something which would require a rewrite. This has finally been done in this update.

Since this is a bigger rewrite, the following use cases needed testing:

• Initial setup
• Onboarding
• Configuration
• Config backup and restore
• Web security
• Navigation with custom web context

A side effect of this change is that the build size have been reduced.

Current size of the build:

dist/index.css     32.01 kB │ gzip:   5.34 kB
dist/index.js     342.41 kB │ gzip: 100.85 kB

After migration:

dist/index.css    32.61 kB │ gzip:  5.37 kB
dist/index.js    227.17 kB │ gzip: 69.87 kB

This means that we are saving 30.95kb of program space after this migration

Fixes: #1015 #1056 #1155