Congrats screen does not refresh every minute

[dae]

A regression in the move to SvelteKit. The 1 minute timer in index.ts is not activated as that file is no longer used, so we'll need to activate the timer elsewhere.

Originally reported on https://forums.ankiweb.net/t/bug-ankimobile-ios-no-refresh/51815

[dae]

(actually, the index.ts file will need to stick around for now as AnkiWeb needs it, but the timer still needs to be put into the SvelteKit path as well)