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/set-function-length/README.md

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+# set-function-length <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+Set a function’s length.
+
+Arguments:
+ - `fn`: the function
+ - `length`: the new length. Must be an integer between 0 and 2**32.
+ - `loose`: Optional. If true, and the length fails to be set, do not throw. Default false.
+
+Returns `fn`.
+
+## Usage
+
+```javascript
+var setFunctionLength = require('set-function-length');
+var assert = require('assert');
+
+function zero() {}
+function one(_) {}
+function two(_, __) {}
+
+assert.equal(zero.length, 0);
+assert.equal(one.length, 1);
+assert.equal(two.length, 2);
+
+assert.equal(setFunctionLength(zero, 10), zero);
+assert.equal(setFunctionLength(one, 11), one);
+assert.equal(setFunctionLength(two, 12), two);
+
+assert.equal(zero.length, 10);
+assert.equal(one.length, 11);
+assert.equal(two.length, 12);
+```
+
+[package-url]: https://npmjs.org/package/set-function-length
+[npm-version-svg]: https://versionbadg.es/ljharb/set-function-length.svg
+[deps-svg]: https://david-dm.org/ljharb/set-function-length.svg
+[deps-url]: https://david-dm.org/ljharb/set-function-length
+[dev-deps-svg]: https://david-dm.org/ljharb/set-function-length/dev-status.svg
+[dev-deps-url]: https://david-dm.org/ljharb/set-function-length#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/set-function-length.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/set-function-length.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/set-function-length.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=set-function-length
+[codecov-image]: https://codecov.io/gh/ljharb/set-function-length/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/ljharb/set-function-length/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/set-function-length
+[actions-url]: https://github.com/ljharb/set-function-length/actions