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/@babel/template/lib/builder.js

@@ -0,0 +1,69 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = createTemplateBuilder;
+var _options = require("./options.js");
+var _string = require("./string.js");
+var _literal = require("./literal.js");
+const NO_PLACEHOLDER = (0, _options.validate)({
+  placeholderPattern: false
+});
+function createTemplateBuilder(formatter, defaultOpts) {
+  const templateFnCache = new WeakMap();
+  const templateAstCache = new WeakMap();
+  const cachedOpts = defaultOpts || (0, _options.validate)(null);
+  return Object.assign((tpl, ...args) => {
+    if (typeof tpl === "string") {
+      if (args.length > 1) throw new Error("Unexpected extra params.");
+      return extendedTrace((0, _string.default)(formatter, tpl, (0, _options.merge)(cachedOpts, (0, _options.validate)(args[0]))));
+    } else if (Array.isArray(tpl)) {
+      let builder = templateFnCache.get(tpl);
+      if (!builder) {
+        builder = (0, _literal.default)(formatter, tpl, cachedOpts);
+        templateFnCache.set(tpl, builder);
+      }
+      return extendedTrace(builder(args));
+    } else if (typeof tpl === "object" && tpl) {
+      if (args.length > 0) throw new Error("Unexpected extra params.");
+      return createTemplateBuilder(formatter, (0, _options.merge)(cachedOpts, (0, _options.validate)(tpl)));
+    }
+    throw new Error(`Unexpected template param ${typeof tpl}`);
+  }, {
+    ast: (tpl, ...args) => {
+      if (typeof tpl === "string") {
+        if (args.length > 1) throw new Error("Unexpected extra params.");
+        return (0, _string.default)(formatter, tpl, (0, _options.merge)((0, _options.merge)(cachedOpts, (0, _options.validate)(args[0])), NO_PLACEHOLDER))();
+      } else if (Array.isArray(tpl)) {
+        let builder = templateAstCache.get(tpl);
+        if (!builder) {
+          builder = (0, _literal.default)(formatter, tpl, (0, _options.merge)(cachedOpts, NO_PLACEHOLDER));
+          templateAstCache.set(tpl, builder);
+        }
+        return builder(args)();
+      }
+      throw new Error(`Unexpected template param ${typeof tpl}`);
+    }
+  });
+}
+function extendedTrace(fn) {
+  let rootStack = "";
+  try {
+    throw new Error();
+  } catch (error) {
+    if (error.stack) {
+      rootStack = error.stack.split("\n").slice(3).join("\n");
+    }
+  }
+  return arg => {
+    try {
+      return fn(arg);
+    } catch (err) {
+      err.stack += `\n    =============\n${rootStack}`;
+      throw err;
+    }
+  };
+}
+
+//# sourceMappingURL=builder.js.map