Support complex expression in CSS v-bind()

Editor assessment

A capability addition dressed as a fix. 'support complex expression in CSS v-bind()' describes newly enabled functionality, previously unsupported expressions now working, which leans `feat` and would justify a minor bump; as a `fix` it under-credits the change in changelog feature sections, though if a prior release promised v-bind() and complex expressions failed, the framing is defensible. The subject itself is excellent: imperative, unmistakable, and comfortably within length limits. The `fix #5109` footer and PR reference provide complete traceability. The body is reference-only; an example of a now-working complex expression would make the changelog entry far more instructive for users. Structurally flawless.