Need to implement the "Search With" submenu for Smartbar CTA button dropdown. Acceptance criteria looks something like this: * dropdown of available search engines is implemented as per [this and left-adjacent figma mocks](https://www.figma.com/design/5KuePTGmOEUFyCHBHCsGim/AI-Mode-%E2%80%94%C2%A0MVP-Scope-Design?node-id=8245-151513&m=dev) * clicking on one of these behaves analogously to the existing "Search with Google" (or whatever the default engine is).
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Implement the "Search With" submenu for Smartbar CTA button dropdown. Acceptance criteria look something like this: * dropdown of available search engines is implemented as per [this and left-adjacent figma mocks](https://www.figma.com/design/5KuePTGmOEUFyCHBHCsGim/AI-Mode-%E2%80%94%C2%A0MVP-Scope-Design?node-id=8245-151513&m=dev) * clicking on one of these behaves analogously to the existing "Search with Google" (or whatever the default engine is).