Set up location filtering logic and zoom in to selection

[nathanhuynhers]

What's new in this PR

Description

Nathan's work:

• Added functionality to draw a polygon on the map based on selected location coordinates.
• Integrated Google Maps Polygon API into the Apply button flow.
• Implemented map zoom and center behavior after applying a location filter:
• The map now fits the polygon bounds using fitBounds().
• After fitting bounds, the map zooms out slightly for a more comfortable view.
• Added state management for the current polygon:
• Old polygons are cleared (setMap(null)) when a new region is applied. Only one polygon is shown at a time.
• Fixed bug with double apply that Ann found (basically it appeared when you click apply twice and nothing's selected, it would still display two Projects), fixed it by not allowing them to apply if nothing selected the second time.

Ethan's work:

• integrated queryCoordsForName with Nathan's edits in /LocationCategoryPanel to efficiently pull the coordinates upon applying the location filter
• found a solution for the "Capital Region" edge case. the data pulled using the API for "Capital Region" for some reason had 3 sets of coordinates, and picking the third set produced the correct shape. we'll def note this in documentation
• found that the database has polygon and multipolygon typed data + handled data accordingly

Screenshots

How to review

• apply a filter in the location dropdown and ensure that the right shape appears by comparing it with the map corresponding to each of the location filters here.

Next steps

• realizing the data pulled using the API is quite messy + unreliable, so we def need to be very specific in documentation how to deal with it if the data ever changes with a CRON job

Relevant links

Online sources

Related PRs

CC: @jjstnlee

[jjstnlee]

hell yea