Add `@vite-pwa/sveltekit` to make the web-wallet a PWA

[kieranhall]

Summary

With the SvelteKit Vite PWA plugin, we can provide the wallet as a PWA, giving the user several advantages such as adding the app to their home-screen and having an offline cache for indexDB amongst other benefits.

[ascartabelli]

FYI:

• https://arstechnica.com/tech-policy/2024/02/apple-disables-iphone-web-apps-in-eu-says-its-too-hard-to-comply-with-rules/
• https://arstechnica.com/tech-policy/2024/02/apple-under-fire-for-disabling-iphone-web-apps-eu-asks-developers-to-weigh-in/

[ascartabelli]

@kieranhall

But now there's this: https://arstechnica.com/gadgets/2024/03/apple-changes-course-will-keep-iphone-eu-web-apps-how-they-are-in-ios-17-4/

[kieranhall]

My personal take on this is that it's a standard (of which vendors can choose to support / might be forced to support due to legislation etc.) and we can quite easily support it following the official Vite plugin (which is the recommended approach given by SvelteKit). The advantage to our users (who can take advantage of this) is quite significant due to the nature of this app. A PWA would be a reasonable stand-in soloution until naitive Dusk apps are available or Dusk is supported in common and popular wallet mobile apps.