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/own-keys/CHANGELOG.md

@@ -0,0 +1,23 @@
+# 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/own-keys/compare/v1.0.0...v1.0.1) - 2024-12-29
+
+### Commits
+
+- [Tests] sort with a proper comparator [`4a65b56`](https://github.com/ljharb/own-keys/commit/4a65b569d10985032a0773806dcdec8866132baa)
+- [Fix] fix function name when `Reflect.ownKeys` is absent [`5cf17cb`](https://github.com/ljharb/own-keys/commit/5cf17cb1c9adfa836a1ddc467da4da20973db2ae)
+
+## v1.0.0 - 2024-12-28
+
+### Commits
+
+- Initial implementation, tests, readme, types [`870a06f`](https://github.com/ljharb/own-keys/commit/870a06f9d7a2a6ecee283319d9a7388f8fc1c811)
+- Initial commit [`70323dc`](https://github.com/ljharb/own-keys/commit/70323dc09541b4ee80426acfc89762605d7fc7bf)
+- npm init [`4a3ad06`](https://github.com/ljharb/own-keys/commit/4a3ad0659defe9a67541c198743bd7733d437725)
+- [Tests] node 0.8 sorts object keys differently [`b449364`](https://github.com/ljharb/own-keys/commit/b4493649ead7441fd8e65ab4718acbd088ceac70)
+- Only apps should have lockfiles [`a54acbf`](https://github.com/ljharb/own-keys/commit/a54acbf2c6b8ef320abf7493b7c88002c690f9c0)