Add progressive web app companion for cross-platform access

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>

pwa/node_modules/tinyglobby/README.md

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+# tinyglobby
+
+[![npm version](https://img.shields.io/npm/v/tinyglobby.svg?maxAge=3600)](https://npmjs.com/package/tinyglobby)
+[![monthly downloads](https://img.shields.io/npm/dm/tinyglobby.svg?maxAge=3600)](https://npmjs.com/package/tinyglobby)
+
+A fast and minimal alternative to globby and fast-glob, meant to behave the same way.
+
+Both globby and fast-glob present some behavior no other globbing lib has,
+which makes it hard to manually replace with something smaller and better.
+
+This library uses only two subdependencies, compared to `globby`'s [23](https://npmgraph.js.org/?q=globby@14.1.0)
+and `fast-glob`'s [17](https://npmgraph.js.org/?q=fast-glob@3.3.3).
+
+## Usage
+
+```js
+import { glob, globSync } from 'tinyglobby';
+
+await glob(['files/*.ts', '!**/*.d.ts'], { cwd: 'src' });
+globSync('src/**/*.ts', { ignore: '**/*.d.ts' });
+```
+
+## Documentation
+
+Visit https://superchupu.dev/tinyglobby to read the full documentation.