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/ejs/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "ejs",
+  "description": "Embedded JavaScript templates",
+  "keywords": [
+    "template",
+    "engine",
+    "ejs"
+  ],
+  "version": "3.1.10",
+  "author": "Matthew Eernisse <mde@fleegix.org> (http://fleegix.org)",
+  "license": "Apache-2.0",
+  "bin": {
+    "ejs": "./bin/cli.js"
+  },
+  "main": "./lib/ejs.js",
+  "jsdelivr": "ejs.min.js",
+  "unpkg": "ejs.min.js",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/mde/ejs.git"
+  },
+  "bugs": "https://github.com/mde/ejs/issues",
+  "homepage": "https://github.com/mde/ejs",
+  "dependencies": {
+    "jake": "^10.8.5"
+  },
+  "devDependencies": {
+    "browserify": "^16.5.1",
+    "eslint": "^6.8.0",
+    "git-directory-deploy": "^1.5.1",
+    "jsdoc": "^4.0.2",
+    "lru-cache": "^4.0.1",
+    "mocha": "^10.2.0",
+    "uglify-js": "^3.3.16"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "test": "npx jake test"
+  }
+}