chore(a11y): silence new a11y warnings from [email protected]

[metonym]

Closes #1683, closes #1704

There is a slew of new a11y warnings in Svelte version >=3.57. This causes warnings to be emitted in the console when consuming this library.

Let's silence these warnings as I believe most if not all are false positives. We can resolve any actual warnings in follow-ups; let's not impede the developer experience for users using the latest Svelte version.

This is best reviewed by commit:

• upgrade svelte to 3.57
• upgrade svelte-check (housekeeping) reverted since it was causing an unrelated CI error
• silence new a11y warnings

To test this locally, you can run either of the following:

yarn svelte-check --workspace src

# OR

yarn build:lib

The expected result is that there should be no a11y warnings emitted to the console.

[theetrain]

Everything else looks good! I double checked wai-aria and most of these are false warnings given that descendents of these items are properly interactive with a keyboard. I suppose <slot> throws off the compiler.

Example menu: https://w3c.github.io/aria/#menu

[pwwang]

Note that this solution doesn't work for vite (@sveltejs/vite-plugin-svelte). Need a workaround to suppress them:

export default defineConfig({
  plugins: [
    svelte({
      onwarn: (warning, handler) => {
        if (warning.code === "a11y-interactive-supports-focus") return
        handler(warning)
      }
    }),
  ],
})