Store Finder enhancments

A few enhancements for the store finder functionality. Will continue updating this issue as early adopter feedback is gathered.

* Make search bar wider/longer, ideally percentage based to fill most of the width of the map on any device size. With current size, autocomplete suggestions are not clearly visible.
* "Near me" button should have some kind of feedback while polling location, perhaps a spinner, as sometimes it can take several seconds to poll location. And ideally, it would populate the search box with the found location for further user confirmation.
* Zoom bounds. When searching for a specific address or zip code, the map is zoomed in very far which can be deceiving if there are no results. Perhaps when querying a location, a max zoom should be implemented to prevent the map from zooming in too far after finding a location.
* Change default search box text to "search by city, address, or zip code"

No se nombran archivos, pruebas ni puntos de entrada; empieza por localizar la UI del buscador de tiendas y su comportamiento de búsqueda, ubicación y mapa. Se considera terminado cuando estén implementadas las cuatro mejoras solicitadas: una barra de búsqueda responsive más ancha, feedback y confirmación para «Cerca de mí», un zoom máximo después de las búsquedas por ubicación y el texto predeterminado especificado.

Escrito por el modelo de indexación a partir del texto del issue.