Thank you for this PR! The implementation looks good, but I think we need to fix CI errors.
Could you please put a _requirements.json with {"svelte": ">=5.0.0"} in test fixtures directories to exclude old Svelte tests?
Could you also fix the linting errors?

https://github.com/sveltejs/eslint-plugin-svelte/blob/main/packages/eslint-plugin-svelte/tests/fixtures/rules/no-inner-declarations/invalid/_requirements.json

In cases like this code, “Found an unnecessary children snippet.” appears, but this is incorrect. It would be better to only inspect inside Svelte components.

{#snippet children()}
  Hi!
{/snippet}

{@render children()}

https://svelte.dev/playground/hello-world?version=5.16.0#H4sIAAAAAAAAE23LywrCMBSE4Vep46aFovusdNd3sC5qM2IgnobkeCPk3SWgC8HtN_9kyHQlDAZ6vzSPJXrbtLROaTv0ODvPBHPI0FeoXQX039c-hE2602u105T4z-dFlKIJBnmdxIVAbeaL8zZS2q6MMurgVqPk7WetJHkXKZbxN0UP5VNhNN5YjuUNEZNJhcEAAAA=