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/generate-sw.js

@@ -0,0 +1,105 @@
+"use strict";
+/*
+  Copyright 2018 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.generateSW = void 0;
+const upath_1 = __importDefault(require("upath"));
+const get_file_manifest_entries_1 = require("./lib/get-file-manifest-entries");
+const rebase_path_1 = require("./lib/rebase-path");
+const validate_options_1 = require("./lib/validate-options");
+const write_sw_using_default_template_1 = require("./lib/write-sw-using-default-template");
+/**
+ * This method creates a list of URLs to precache, referred to as a "precache
+ * manifest", based on the options you provide.
+ *
+ * It also takes in additional options that configures the service worker's
+ * behavior, like any `runtimeCaching` rules it should use.
+ *
+ * Based on the precache manifest and the additional configuration, it writes
+ * a ready-to-use service worker file to disk at `swDest`.
+ *
+ * ```
+ * // The following lists some common options; see the rest of the documentation
+ * // for the full set of options and defaults.
+ * const {count, size, warnings} = await generateSW({
+ *   dontCacheBustURLsMatching: [new RegExp('...')],
+ *   globDirectory: '...',
+ *   globPatterns: ['...', '...'],
+ *   maximumFileSizeToCacheInBytes: ...,
+ *   navigateFallback: '...',
+ *   runtimeCaching: [{
+ *     // Routing via a matchCallback function:
+ *     urlPattern: ({request, url}) => ...,
+ *     handler: '...',
+ *     options: {
+ *       cacheName: '...',
+ *       expiration: {
+ *         maxEntries: ...,
+ *       },
+ *     },
+ *   }, {
+ *     // Routing via a RegExp:
+ *     urlPattern: new RegExp('...'),
+ *     handler: '...',
+ *     options: {
+ *       cacheName: '...',
+ *       plugins: [..., ...],
+ *     },
+ *   }],
+ *   skipWaiting: ...,
+ *   swDest: '...',
+ * });
+ * ```
+ *
+ * @memberof workbox-build
+ */
+async function generateSW(config) {
+    const options = (0, validate_options_1.validateGenerateSWOptions)(config);
+    let entriesResult;
+    if (options.globDirectory) {
+        // Make sure we leave swDest out of the precache manifest.
+        options.globIgnores.push((0, rebase_path_1.rebasePath)({
+            baseDirectory: options.globDirectory,
+            file: options.swDest,
+        }));
+        // If we create an extra external runtime file, ignore that, too.
+        // See https://rollupjs.org/guide/en/#outputchunkfilenames for naming.
+        if (!options.inlineWorkboxRuntime) {
+            const swDestDir = upath_1.default.dirname(options.swDest);
+            const workboxRuntimeFile = upath_1.default.join(swDestDir, 'workbox-*.js');
+            options.globIgnores.push((0, rebase_path_1.rebasePath)({
+                baseDirectory: options.globDirectory,
+                file: workboxRuntimeFile,
+            }));
+        }
+        // We've previously asserted that options.globDirectory is set, so this
+        // should be a safe cast.
+        entriesResult = await (0, get_file_manifest_entries_1.getFileManifestEntries)(options);
+    }
+    else {
+        entriesResult = {
+            count: 0,
+            manifestEntries: [],
+            size: 0,
+            warnings: [],
+        };
+    }
+    const filePaths = await (0, write_sw_using_default_template_1.writeSWUsingDefaultTemplate)(Object.assign({
+        manifestEntries: entriesResult.manifestEntries,
+    }, options));
+    return {
+        filePaths,
+        count: entriesResult.count,
+        size: entriesResult.size,
+        warnings: entriesResult.warnings,
+    };
+}
+exports.generateSW = generateSW;