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/pathe/package.json

@@ -0,0 +1,48 @@
+{
+  "name": "pathe",
+  "version": "1.1.2",
+  "description": "Universal filesystem path utils",
+  "repository": "unjs/pathe",
+  "license": "MIT",
+  "sideEffects": false,
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs"
+    },
+    "./utils": {
+      "types": "./dist/utils.d.ts",
+      "import": "./dist/utils.mjs",
+      "require": "./dist/utils.cjs"
+    }
+  },
+  "main": "./dist/index.cjs",
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist",
+    "utils.d.ts"
+  ],
+  "devDependencies": {
+    "@types/node": "^20.10.8",
+    "@vitest/coverage-v8": "^1.1.3",
+    "changelogen": "^0.5.5",
+    "eslint": "^8.56.0",
+    "eslint-config-unjs": "^0.2.1",
+    "jiti": "^1.21.0",
+    "prettier": "^3.1.1",
+    "typescript": "^5.3.3",
+    "unbuild": "^2.0.0",
+    "vitest": "^1.1.3"
+  },
+  "packageManager": "pnpm@8.14.0",
+  "scripts": {
+    "build": "unbuild",
+    "dev": "vitest",
+    "lint": "eslint --ext .ts . && prettier -c src test",
+    "lint:fix": "eslint --cache --ext .ts,.js,.mjs,.cjs . --fix && prettier -c src test -w",
+    "release": "pnpm test && pnpm build && changelogen --release && pnpm publish && git push --follow-tags",
+    "test": "pnpm lint && vitest run --coverage",
+    "test:types": "tsc --noEmit"
+  }
+}