Patch Changes

• aea7dde: Fix mobile popup-blocker swallowing primary/secondary button link clicks. When a step exposes primaryButton.uri (or the legacy primaryButtonUri) and the consumer hasn't overridden the navigate prop, the button now renders as a native <a href target rel> so the browser handles navigation directly. Previously the click triggered window.open after an awaited step.complete, which iOS Safari and Chrome Android silently block as a popup because the user-gesture context was lost. Buttons without a URI, and buttons under a custom navigate handler, are unchanged. Visual styling is identical.