Task: Show error message if map fails to load

[CodeWritingCow]

Describe the task

When the map fails to fetch a pmtiles file from Google Cloud, hide loading spinner and show an error message in src/components/PropertyMap.tsx

Currently, the map page shows the loading spinner spins endlessly with the message "Loading properties." This makes for a poor user experience.

Acceptance Criteria

• Hide loading spinner
• Show error message instead of "Loading properties"
• Show error message saying, "We are having technical issues. Please try again later."

Additional context

• This ticket is related to Hotfix: Vacant properties pmtiles missing #709. While working on that PR, I noticed that if the map page got a 404 error for the pmtiles file, it would get stuck on "Loading properties." The loader would spin endlessly.
• Here's a screenshot of what that looks like to a user:

[Michael-Dratch]

Can I pick up this task?

[bacitracin]

@Michael-Dratch assigned!