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/vite-plugin-pwa/dist/chunk-UB6OAFZF.js

@@ -0,0 +1,109 @@
+var __require = /* @__PURE__ */ ((x) => typeof require !== "undefined" ? require : typeof Proxy !== "undefined" ? new Proxy(x, {
+  get: (a, b) => (typeof require !== "undefined" ? require : a)[b]
+}) : x)(function(x) {
+  if (typeof require !== "undefined")
+    return require.apply(this, arguments);
+  throw Error('Dynamic require of "' + x + '" is not supported');
+});
+
+// node_modules/.pnpm/kolorist@1.8.0/node_modules/kolorist/dist/esm/index.mjs
+var enabled = true;
+var globalVar = typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : typeof global !== "undefined" ? global : {};
+var supportLevel = 0;
+if (globalVar.process && globalVar.process.env && globalVar.process.stdout) {
+  const { FORCE_COLOR, NODE_DISABLE_COLORS, NO_COLOR, TERM, COLORTERM } = globalVar.process.env;
+  if (NODE_DISABLE_COLORS || NO_COLOR || FORCE_COLOR === "0") {
+    enabled = false;
+  } else if (FORCE_COLOR === "1" || FORCE_COLOR === "2" || FORCE_COLOR === "3") {
+    enabled = true;
+  } else if (TERM === "dumb") {
+    enabled = false;
+  } else if ("CI" in globalVar.process.env && [
+    "TRAVIS",
+    "CIRCLECI",
+    "APPVEYOR",
+    "GITLAB_CI",
+    "GITHUB_ACTIONS",
+    "BUILDKITE",
+    "DRONE"
+  ].some((vendor) => vendor in globalVar.process.env)) {
+    enabled = true;
+  } else {
+    enabled = process.stdout.isTTY;
+  }
+  if (enabled) {
+    if (process.platform === "win32") {
+      supportLevel = 3;
+    } else {
+      if (COLORTERM && (COLORTERM === "truecolor" || COLORTERM === "24bit")) {
+        supportLevel = 3;
+      } else if (TERM && (TERM.endsWith("-256color") || TERM.endsWith("256"))) {
+        supportLevel = 2;
+      } else {
+        supportLevel = 1;
+      }
+    }
+  }
+}
+var options = {
+  enabled,
+  supportLevel
+};
+function kolorist(start, end, level = 1) {
+  const open = `\x1B[${start}m`;
+  const close = `\x1B[${end}m`;
+  const regex = new RegExp(`\\x1b\\[${end}m`, "g");
+  return (str) => {
+    return options.enabled && options.supportLevel >= level ? open + ("" + str).replace(regex, open) + close : "" + str;
+  };
+}
+var reset = kolorist(0, 0);
+var bold = kolorist(1, 22);
+var dim = kolorist(2, 22);
+var italic = kolorist(3, 23);
+var underline = kolorist(4, 24);
+var inverse = kolorist(7, 27);
+var hidden = kolorist(8, 28);
+var strikethrough = kolorist(9, 29);
+var black = kolorist(30, 39);
+var red = kolorist(31, 39);
+var green = kolorist(32, 39);
+var yellow = kolorist(33, 39);
+var blue = kolorist(34, 39);
+var magenta = kolorist(35, 39);
+var cyan = kolorist(36, 39);
+var white = kolorist(97, 39);
+var gray = kolorist(90, 39);
+var lightGray = kolorist(37, 39);
+var lightRed = kolorist(91, 39);
+var lightGreen = kolorist(92, 39);
+var lightYellow = kolorist(93, 39);
+var lightBlue = kolorist(94, 39);
+var lightMagenta = kolorist(95, 39);
+var lightCyan = kolorist(96, 39);
+var bgBlack = kolorist(40, 49);
+var bgRed = kolorist(41, 49);
+var bgGreen = kolorist(42, 49);
+var bgYellow = kolorist(43, 49);
+var bgBlue = kolorist(44, 49);
+var bgMagenta = kolorist(45, 49);
+var bgCyan = kolorist(46, 49);
+var bgWhite = kolorist(107, 49);
+var bgGray = kolorist(100, 49);
+var bgLightRed = kolorist(101, 49);
+var bgLightGreen = kolorist(102, 49);
+var bgLightYellow = kolorist(103, 49);
+var bgLightBlue = kolorist(104, 49);
+var bgLightMagenta = kolorist(105, 49);
+var bgLightCyan = kolorist(106, 49);
+var bgLightGray = kolorist(47, 49);
+
+export {
+  __require,
+  dim,
+  red,
+  green,
+  yellow,
+  magenta,
+  cyan
+};