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/vitest/dist/config.cjs

@@ -0,0 +1,158 @@
+'use strict';
+
+var os = require('node:os');
+var stdEnv = require('std-env');
+var vite = require('vite');
+
+const defaultBrowserPort = 63315;
+const extraInlineDeps = [
+  /^(?!.*node_modules).*\.mjs$/,
+  /^(?!.*node_modules).*\.cjs\.js$/,
+  // Vite client
+  /vite\w*\/dist\/client\/env.mjs/
+];
+
+const isNode = typeof process < "u" && typeof process.stdout < "u" && !process.versions?.deno && !globalThis.window;
+const isDeno = typeof process < "u" && typeof process.stdout < "u" && process.versions?.deno !== void 0;
+(isNode || isDeno) && process.platform === "win32";
+
+const defaultInclude = ["**/*.{test,spec}.?(c|m)[jt]s?(x)"];
+const defaultExclude = [
+  "**/node_modules/**",
+  "**/dist/**",
+  "**/cypress/**",
+  "**/.{idea,git,cache,output,temp}/**",
+  "**/{karma,rollup,webpack,vite,vitest,jest,ava,babel,nyc,cypress,tsup,build,eslint,prettier}.config.*"
+];
+const defaultCoverageExcludes = [
+  "coverage/**",
+  "dist/**",
+  "**/node_modules/**",
+  "**/[.]**",
+  "packages/*/test?(s)/**",
+  "**/*.d.ts",
+  "**/virtual:*",
+  "**/__x00__*",
+  "**/\0*",
+  "cypress/**",
+  "test?(s)/**",
+  "test?(-*).?(c|m)[jt]s?(x)",
+  "**/*{.,-}{test,spec,bench,benchmark}?(-d).?(c|m)[jt]s?(x)",
+  "**/__tests__/**",
+  "**/{karma,rollup,webpack,vite,vitest,jest,ava,babel,nyc,cypress,tsup,build,eslint,prettier}.config.*",
+  "**/vitest.{workspace,projects}.[jt]s?(on)",
+  "**/.{eslint,mocha,prettier}rc.{?(c|m)js,yml}"
+];
+const coverageConfigDefaults = {
+  provider: "v8",
+  enabled: false,
+  all: true,
+  clean: true,
+  cleanOnRerun: true,
+  reportsDirectory: "./coverage",
+  exclude: defaultCoverageExcludes,
+  reportOnFailure: false,
+  reporter: [
+    ["text", {}],
+    ["html", {}],
+    ["clover", {}],
+    ["json", {}]
+  ],
+  extension: [
+    ".js",
+    ".cjs",
+    ".mjs",
+    ".ts",
+    ".mts",
+    ".tsx",
+    ".jsx",
+    ".vue",
+    ".svelte",
+    ".marko",
+    ".astro"
+  ],
+  allowExternal: false,
+  excludeAfterRemap: false,
+  ignoreEmptyLines: true,
+  processingConcurrency: Math.min(
+    20,
+    os.availableParallelism?.() ?? os.cpus().length
+  )
+};
+const fakeTimersDefaults = {
+  loopLimit: 1e4,
+  shouldClearNativeTimers: true,
+  toFake: [
+    "setTimeout",
+    "clearTimeout",
+    "setInterval",
+    "clearInterval",
+    "setImmediate",
+    "clearImmediate",
+    "Date"
+  ]
+};
+const config = {
+  allowOnly: !stdEnv.isCI,
+  isolate: true,
+  watch: !stdEnv.isCI,
+  globals: false,
+  environment: "node",
+  pool: "forks",
+  clearMocks: false,
+  restoreMocks: false,
+  mockReset: false,
+  unstubGlobals: false,
+  unstubEnvs: false,
+  include: defaultInclude,
+  exclude: defaultExclude,
+  teardownTimeout: 1e4,
+  forceRerunTriggers: ["**/package.json/**", "**/{vitest,vite}.config.*/**"],
+  update: false,
+  reporters: [],
+  silent: false,
+  hideSkippedTests: false,
+  api: false,
+  ui: false,
+  uiBase: "/__vitest__/",
+  open: !stdEnv.isCI,
+  css: {
+    include: []
+  },
+  coverage: coverageConfigDefaults,
+  fakeTimers: fakeTimersDefaults,
+  maxConcurrency: 5,
+  dangerouslyIgnoreUnhandledErrors: false,
+  typecheck: {
+    checker: "tsc",
+    include: ["**/*.{test,spec}-d.?(c|m)[jt]s?(x)"],
+    exclude: defaultExclude
+  },
+  slowTestThreshold: 300,
+  disableConsoleIntercept: false
+};
+const configDefaults = Object.freeze(config);
+
+function defineConfig(config) {
+  return config;
+}
+function defineProject(config) {
+  return config;
+}
+function defineWorkspace(config) {
+  return config;
+}
+
+Object.defineProperty(exports, "mergeConfig", {
+  enumerable: true,
+  get: function () { return vite.mergeConfig; }
+});
+exports.configDefaults = configDefaults;
+exports.coverageConfigDefaults = coverageConfigDefaults;
+exports.defaultBrowserPort = defaultBrowserPort;
+exports.defaultExclude = defaultExclude;
+exports.defaultInclude = defaultInclude;
+exports.defineConfig = defineConfig;
+exports.defineProject = defineProject;
+exports.defineWorkspace = defineWorkspace;
+exports.extraInlineDeps = extraInlineDeps;