Improve trip autocomplete dropdown interactions

Improve dropdown interactions for trip address autocomplete and neighborhood search autocomplete. React-aria components we used to build autocomplete/dropdowns are more tightly constrained than we need and are buggy as a child component within a modal.

Goal of this issue is to clean up how we implement Autocomplete, in readability/maintainability as well as less buggy UI, specifically component should be updated to allow keyboard navigation with more intuitive keyboard selection (enter/tab).

Identify if possible to have Autocomplete dropdown within a modal component (within another modal) using react-aria. If not move forward without using react-aria components. Since headless, might be more efficient to pull in Autocomplete component from different library like Hero-UI (still react-aria under the hood) or shadcn.

Locate the trip address and neighborhood search autocomplete components, then reproduce their behavior inside the nested modal. Compare the current react-aria behavior with the desired keyboard navigation and selection using Enter and Tab; done means the dropdown is maintainable and works reliably within the modal.

Written by the indexing model from the issue text.