Add GPS location caching service

[latin-panda]

Description

Implement a centralized GPS location caching service with timeout to share current location across multiple components, reducing redundant GPS lookups, wait times, and battery usage.

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Checklist

• Does it need UI/UX design?
  • Yes. Describe the UI/UX requirements or attach a Figma link in the "Design" section.
  • No
• Does it need API design?
  • Yes. Specify the endpoints, methods, or data structures needed.
  • No
• Does it need design around state flow?
  • Yes. Outline the state flow requirements.
  • No
• Does it need a test plan?
  • Yes. Add the test plan as a comment in this task or attach the document.
  • No

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User Stories

As an user with multiple maps in a form,
I want the "zoom to current location" feature to respond instantly on subsequent maps after the first use,
so that I don’t experience repeated delays or excessive battery drain.

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Related Issues

• feat(#257): Add geopoint with maps and placement-map appearances #536 (review)