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-routing/utils/constants.d.ts

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+import '../_version.js';
+export type HTTPMethod = 'DELETE' | 'GET' | 'HEAD' | 'PATCH' | 'POST' | 'PUT';
+/**
+ * The default HTTP method, 'GET', used when there's no specific method
+ * configured for a route.
+ *
+ * @type {string}
+ *
+ * @private
+ */
+export declare const defaultMethod: HTTPMethod;
+/**
+ * The list of valid HTTP methods associated with requests that could be routed.
+ *
+ * @type {Array<string>}
+ *
+ * @private
+ */
+export declare const validMethods: HTTPMethod[];

pwa/node_modules/workbox-routing/utils/constants.js

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+/*
+  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.
+*/
+import '../_version.js';
+/**
+ * The default HTTP method, 'GET', used when there's no specific method
+ * configured for a route.
+ *
+ * @type {string}
+ *
+ * @private
+ */
+export const defaultMethod = 'GET';
+/**
+ * The list of valid HTTP methods associated with requests that could be routed.
+ *
+ * @type {Array<string>}
+ *
+ * @private
+ */
+export const validMethods = [
+    'DELETE',
+    'GET',
+    'HEAD',
+    'PATCH',
+    'POST',
+    'PUT',
+];

pwa/node_modules/workbox-routing/utils/constants.mjs

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+export * from './constants.js';

pwa/node_modules/workbox-routing/utils/getOrCreateDefaultRouter.d.ts

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+import { Router } from '../Router.js';
+import '../_version.js';
+/**
+ * Creates a new, singleton Router instance if one does not exist. If one
+ * does already exist, that instance is returned.
+ *
+ * @private
+ * @return {Router}
+ */
+export declare const getOrCreateDefaultRouter: () => Router;

pwa/node_modules/workbox-routing/utils/getOrCreateDefaultRouter.js

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+/*
+  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.
+*/
+import { Router } from '../Router.js';
+import '../_version.js';
+let defaultRouter;
+/**
+ * Creates a new, singleton Router instance if one does not exist. If one
+ * does already exist, that instance is returned.
+ *
+ * @private
+ * @return {Router}
+ */
+export const getOrCreateDefaultRouter = () => {
+    if (!defaultRouter) {
+        defaultRouter = new Router();
+        // The helpers that use the default Router assume these listeners exist.
+        defaultRouter.addFetchListener();
+        defaultRouter.addCacheListener();
+    }
+    return defaultRouter;
+};

pwa/node_modules/workbox-routing/utils/getOrCreateDefaultRouter.mjs

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+export * from './getOrCreateDefaultRouter.js';

pwa/node_modules/workbox-routing/utils/normalizeHandler.d.ts

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+import { RouteHandler, RouteHandlerObject } from 'workbox-core/types.js';
+import '../_version.js';
+/**
+ * @param {function()|Object} handler Either a function, or an object with a
+ * 'handle' method.
+ * @return {Object} An object with a handle method.
+ *
+ * @private
+ */
+export declare const normalizeHandler: (handler: RouteHandler) => RouteHandlerObject;

pwa/node_modules/workbox-routing/utils/normalizeHandler.js

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+/*
+  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.
+*/
+import { assert } from 'workbox-core/_private/assert.js';
+import '../_version.js';
+/**
+ * @param {function()|Object} handler Either a function, or an object with a
+ * 'handle' method.
+ * @return {Object} An object with a handle method.
+ *
+ * @private
+ */
+export const normalizeHandler = (handler) => {
+    if (handler && typeof handler === 'object') {
+        if (process.env.NODE_ENV !== 'production') {
+            assert.hasMethod(handler, 'handle', {
+                moduleName: 'workbox-routing',
+                className: 'Route',
+                funcName: 'constructor',
+                paramName: 'handler',
+            });
+        }
+        return handler;
+    }
+    else {
+        if (process.env.NODE_ENV !== 'production') {
+            assert.isType(handler, 'function', {
+                moduleName: 'workbox-routing',
+                className: 'Route',
+                funcName: 'constructor',
+                paramName: 'handler',
+            });
+        }
+        return { handle: handler };
+    }
+};

pwa/node_modules/workbox-routing/utils/normalizeHandler.mjs

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+export * from './normalizeHandler.js';