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Add progressive web app companion for cross-platform access

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Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Ole-Morten Duesund 2026-03-08 17:41:38 +01:00
commit e8428de775
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pwa/node_modules/leaflet.offline/examples/map-wmts/index.html generated vendored Normal file
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Custom Layer (WMTS)</title>
</head>
<body>
<div class="container-fluid py-md-3">
<main id="app">
<h1>WMTS</h1>
<p>
This leaflet WMTS layer uses the download & save methods from the
<a
href="https://github.com/allartk/leaflet.offline/blob/master/docs/api.md#tilemanagerdownloadtiletileurl--promiseblob"
target="_blank"
>API</a
>
to save all viewed tiles for offline usage.
</p>
<div id="map" style="height: 75vh"></div>
</main>
</div>
<script type="module" src="/src/main.ts"></script>
</body>
</html>