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/tr46/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "tr46",
+  "version": "1.0.1",
+  "description": "An implementation of the Unicode TR46 spec",
+  "main": "index.js",
+  "files": [
+    "index.js",
+    "lib/mappingTable.json",
+    "lib/regexes.js"
+  ],
+  "scripts": {
+    "test": "mocha",
+    "lint": "eslint .",
+    "pretest": "node scripts/getLatestTests.js",
+    "prepublish": "node scripts/generateMappingTable.js && node scripts/generateRegexes.js"
+  },
+  "repository": "Sebmaster/tr46.js",
+  "keywords": [
+    "unicode",
+    "tr46",
+    "url",
+    "whatwg"
+  ],
+  "author": "Sebastian Mayr <npm@smayr.name>",
+  "license": "MIT",
+  "dependencies": {
+    "punycode": "^2.1.0"
+  },
+  "devDependencies": {
+    "eslint": "^3.13.0",
+    "mocha": "^3.2.0",
+    "regenerate": "^1.3.2",
+    "request": "^2.79.0",
+    "unicode-10.0.0": "^0.7.4"
+  },
+  "unicodeVersion": "10.0.0"
+}