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/jsonpointer/package.json

@@ -0,0 +1,48 @@
+{
+  "name": "jsonpointer",
+  "description": "Simple JSON Addressing.",
+  "tags": [
+    "util",
+    "simple",
+    "util",
+    "utility"
+  ],
+  "version": "5.0.1",
+  "author": "Jan Lehnardt <jan@apache.org>",
+  "contributors": [
+    "Joe Hildebrand <joe-github@cursive.net>",
+    "Marc Bachmann <marc.brookman@gmail.com>"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/janl/node-jsonpointer.git"
+  },
+  "bugs": {
+    "url": "http://github.com/janl/node-jsonpointer/issues"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "main": "./jsonpointer",
+  "typings": "jsonpointer.d.ts",
+  "files": [
+    "jsonpointer.js",
+    "jsonpointer.d.ts"
+  ],
+  "scripts": {
+    "test": "npm run test:standard && npm run test:all",
+    "test:standard": "standard",
+    "test:all": "node test.js",
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post"
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "semantic-release": "^18.0.0",
+    "standard": "^16.0.4"
+  },
+  "standard": {
+    "ignore": [
+      "test.js"
+    ]
+  }
+}