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/@rollup/pluginutils/package.json

@@ -0,0 +1,91 @@
+{
+  "name": "@rollup/pluginutils",
+  "version": "3.1.0",
+  "publishConfig": {
+    "access": "public"
+  },
+  "description": "A set of utility functions commonly used by Rollup plugins",
+  "license": "MIT",
+  "repository": "rollup/plugins",
+  "author": "Rich Harris <richard.a.harris@gmail.com>",
+  "homepage": "https://github.com/rollup/plugins/tree/master/packages/pluginutils#readme",
+  "bugs": {
+    "url": "https://github.com/rollup/plugins/issues"
+  },
+  "main": "./dist/cjs/index.js",
+  "engines": {
+    "node": ">= 8.0.0"
+  },
+  "scripts": {
+    "build": "rollup -c",
+    "ci:coverage": "nyc pnpm run test && nyc report --reporter=text-lcov > coverage.lcov",
+    "ci:lint": "pnpm run build && pnpm run lint",
+    "ci:lint:commits": "commitlint --from=${CIRCLE_BRANCH} --to=${CIRCLE_SHA1}",
+    "ci:test": "pnpm run test -- --verbose",
+    "lint": "pnpm run lint:js && pnpm run lint:docs && pnpm run lint:package",
+    "lint:docs": "prettier --single-quote --write README.md",
+    "lint:js": "eslint --fix --cache src test types --ext .js,.ts",
+    "lint:package": "prettier --write package.json --plugin=prettier-plugin-package",
+    "prebuild": "del-cli dist",
+    "prepare": "pnpm run build",
+    "prepublishOnly": "pnpm run lint && pnpm run build",
+    "pretest": "pnpm run build -- --sourcemap",
+    "test": "ava"
+  },
+  "files": [
+    "dist",
+    "types",
+    "README.md",
+    "LICENSE"
+  ],
+  "keywords": [
+    "rollup",
+    "plugin",
+    "utils"
+  ],
+  "peerDependencies": {
+    "rollup": "^1.20.0||^2.0.0"
+  },
+  "dependencies": {
+    "@types/estree": "0.0.39",
+    "estree-walker": "^1.0.1",
+    "picomatch": "^2.2.2"
+  },
+  "devDependencies": {
+    "@rollup/plugin-commonjs": "^11.0.2",
+    "@rollup/plugin-node-resolve": "^7.1.1",
+    "@rollup/plugin-typescript": "^3.0.0",
+    "@types/jest": "^24.9.0",
+    "@types/node": "^12.12.25",
+    "@types/picomatch": "^2.2.1",
+    "typescript": "^3.7.5"
+  },
+  "ava": {
+    "compileEnhancements": false,
+    "extensions": [
+      "ts"
+    ],
+    "require": [
+      "ts-node/register"
+    ],
+    "files": [
+      "!**/fixtures/**",
+      "!**/helpers/**",
+      "!**/recipes/**",
+      "!**/types.ts"
+    ]
+  },
+  "exports": {
+    "require": "./dist/cjs/index.js",
+    "import": "./dist/es/index.js"
+  },
+  "module": "./dist/es/index.js",
+  "nyc": {
+    "extension": [
+      ".js",
+      ".ts"
+    ]
+  },
+  "type": "commonjs",
+  "types": "types/index.d.ts"
+}