Patch Changes

• fix: ensure use directives execute in the correct sequence (#13384)

• fix: blank CSS contents while migrating (#13403)

• fix: avoid migrating slots in custom elements (#13406)

• fix: don't consider children of rules when checking whether they are used or not (#13410)

• fix: treat <img> alt attribute as content for a11y labelling purposes (#13411)

• fix: make ownership widening more robust to userland proxies (#13377)

• fix: validation should not fail on anonymous declarations (#13393)