Fix 19hz and main site localStorage cache key collision

[Copilot]

Both map.js and 19hz/map.js use the same localStorage keys (events, events_age), causing them to overwrite each other's cached event data since both are served from the same origin.

Changes

• 19hz/map.js: Rename localStorage keys from events/events_age to 19hz_events/19hz_events_age

// Before (collides with root map.js)
window.localStorage.getItem('events')
window.localStorage.setItem('events_age', Date.now())

// After
window.localStorage.getItem('19hz_events')
window.localStorage.setItem('19hz_events_age', Date.now())

Root map.js keys are unchanged.

Original prompt

19hz cache and regular site cache are clobbering each other please use distinct caches

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[github-actions]

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2026-03-19 07:07 UTC