iOS Safari can discard page JS state when backgrounding to open the camera.
Saving gpsCoords to sessionStorage ensures the coords survive the round-trip
and are still available when handleUpload runs after the photo is taken.
Also change the server-side geocode fallback from empty string to raw lat/lon
so the location column in the Excel sheet is never silently empty.
https://claude.ai/code/session_015myTTMs6yDsAGarATe5ePZ
Replace silent on-load getCurrentPosition with an opt-in button on
step 1. iOS Safari requires a user gesture for the permission prompt
to appear; calling it on page load suppresses the dialog. The button
triggers the request on tap, shows "Getting location…" while waiting,
and surfaces permission-denied / timeout errors with clear messages.
https://claude.ai/code/session_015myTTMs6yDsAGarATe5ePZ
