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/side-channel-map/CHANGELOG.md

@@ -0,0 +1,22 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v1.0.1](https://github.com/ljharb/side-channel-map/compare/v1.0.0...v1.0.1) - 2024-12-10
+
+### Commits
+
+- [Deps] update `call-bound` [`6d05aaa`](https://github.com/ljharb/side-channel-map/commit/6d05aaa4ce5f2be4e7825df433d650696f0ba40f)
+- [types] fix generics ordering [`11c0184`](https://github.com/ljharb/side-channel-map/commit/11c0184132ac11fdc16857e12682e148e5e9ee74)
+
+## v1.0.0 - 2024-12-10
+
+### Commits
+
+- Initial implementation, tests, readme, types [`ad877b4`](https://github.com/ljharb/side-channel-map/commit/ad877b42926d46d63fff76a2bd01d2b4a01959a9)
+- Initial commit [`28f8879`](https://github.com/ljharb/side-channel-map/commit/28f8879c512abe8fcf9b6a4dc7754a0287e5eba4)
+- npm init [`2c9604e`](https://github.com/ljharb/side-channel-map/commit/2c9604e5aa40223e425ea7cea78f8a07697504bd)
+- Only apps should have lockfiles [`5e7ba9c`](https://github.com/ljharb/side-channel-map/commit/5e7ba9cffe3ef42095815adc8ac1255b49bbadf5)