Collapse style issue when expandIconPosition is right

Editor assessment

The subject states the defect precisely — the Collapse has a style issue when `expandIconPosition` is set to right — naming the component, the prop, the offending value, and the symptom class, so the change is understandable without a diff. The well-formed `Co-authored-by: ext.zhangtianyi3 <email>` trailer attributes the contributor. No body is present, which is acceptable for a scoped visual fix under the small-change exemption, though the specific visual defect is left to the linked review. Type `fix` is accurate; absent scope is tolerable. Style is clean. A clear, publishable example at good.