Support absolute urls in webpack css url/import

Editor assessment

The subject states the capability and its surface — absolute URLs work in webpack css url and import handling — so the header communicates the fix and the previously failing case without the diff, and fix(webpack) classifies and locates it correctly. Hygiene is mostly clean, though webpack is stated twice across scope and subject. No body is present, tolerable for a contained asset-resolution fix, and no footer is required. A line on the broken stylesheet output users saw would add depth; the message is already clear, accurate, and publishable.