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/workbox-build/build/lib/module-registry.js

@@ -0,0 +1,70 @@
+"use strict";
+/*
+  Copyright 2019 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ModuleRegistry = void 0;
+const common_tags_1 = require("common-tags");
+const upath_1 = __importDefault(require("upath"));
+/**
+ * Class for keeping track of which Workbox modules are used by the generated
+ * service worker script.
+ *
+ * @private
+ */
+class ModuleRegistry {
+    /**
+     * @private
+     */
+    constructor() {
+        this._modulesUsed = new Map();
+    }
+    /**
+     * @return {Array<string>} A list of all of the import statements that are
+     * needed for the modules being used.
+     * @private
+     */
+    getImportStatements() {
+        const workboxModuleImports = [];
+        for (const [localName, { moduleName, pkg }] of this._modulesUsed) {
+            // By default require.resolve returns the resolved path of the 'main'
+            // field, which might be deeper than the package root. To work around
+            // this, we can find the package's root by resolving its package.json and
+            // strip the '/package.json' from the resolved path.
+            const pkgJsonPath = require.resolve(`${pkg}/package.json`);
+            const pkgRoot = upath_1.default.dirname(pkgJsonPath);
+            const importStatement = (0, common_tags_1.oneLine) `import {${moduleName} as ${localName}} from
+        '${pkgRoot}/${moduleName}.mjs';`;
+            workboxModuleImports.push(importStatement);
+        }
+        return workboxModuleImports;
+    }
+    /**
+     * @param {string} pkg The workbox package that the module belongs to.
+     * @param {string} moduleName The name of the module to import.
+     * @return {string} The local variable name that corresponds to that module.
+     * @private
+     */
+    getLocalName(pkg, moduleName) {
+        return `${pkg.replace(/-/g, '_')}_${moduleName}`;
+    }
+    /**
+     * @param {string} pkg The workbox package that the module belongs to.
+     * @param {string} moduleName The name of the module to import.
+     * @return {string} The local variable name that corresponds to that module.
+     * @private
+     */
+    use(pkg, moduleName) {
+        const localName = this.getLocalName(pkg, moduleName);
+        this._modulesUsed.set(localName, { moduleName, pkg });
+        return localName;
+    }
+}
+exports.ModuleRegistry = ModuleRegistry;