refactor(mobile): map heatmap color and location picker

[shenlong-tanwen]

Changes made in the PR:

• Updates the heat-map colors to use the previous gradient colors
• Updates the location picker to display the buttons above the mobile navigation bar

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	b64abe0
Status:	⚡️  Build in progress...

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[alextran1502]

The map keep crashing when I try to test this PR, can you run the PR again and see if you see the same thing?

[shenlong-tanwen]

The map keep crashing when I try to test this PR, can you run the PR again and see if you see the same thing?

Thanks a lot. Looks like the android native library handles color strings in the format rgba(x,x,x) even if the alpha part is not available, however, the iOS native app on the other hand, crashes hard. Updated it and it should be good now