feat!: add Svelte 5 runes compiler support

[userquin]

Description

See description.

We need to check if we need new custom types for runes or Svelte 5.

/cc @benmccann
/cc @dominikg

Linked Issues

closes #346

Additional context

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[r-unruh]

You might want to add another case to the switch in src/index.ts.

[userquin]

We cannot use $props() directly in runes, we need the script (we cannot use $ as prefix in variable name in runes, it is a reserved prefix):

Working example

Reserved prefix error:

[userquin]

https://github.com/userquin/unplugin-icons-svelte-runes

[userquin]

When removing {@html ...} from runes compiler, it seems we've found an Svelte 5 bug (?), generating all children variables but not being used:

In both cases:

Without {@html ...} (there is an extra > after svg, tested also fixing it):

With {@html ...}:

[benmccann]

generating all children variables but not being used

I've reported that one in the past. They stated it's low priority because the bundler will remove the unused variables

[userquin]

I've reported that one in the past. They stated it's low priority because the bundler will remove the unused variables

ok, adding optimization, I'll check also the build output and create a new branch in my previous repo

[userquin]

https://github.com/userquin/unplugin-icons-svelte-runes/tree/runes-optimization