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-navigation-preload/build/workbox-navigation-preload.dev.js

@@ -0,0 +1,99 @@
+this.workbox = this.workbox || {};
+this.workbox.navigationPreload = (function (exports, logger_js) {
+    'use strict';
+
+    // @ts-ignore
+    try {
+      self['workbox:navigation-preload:7.3.0'] && _();
+    } catch (e) {}
+
+    /*
+      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.
+    */
+    /**
+     * @return {boolean} Whether or not the current browser supports enabling
+     * navigation preload.
+     *
+     * @memberof workbox-navigation-preload
+     */
+    function isSupported() {
+      return Boolean(self.registration && self.registration.navigationPreload);
+    }
+
+    /*
+      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.
+    */
+    /**
+     * If the browser supports Navigation Preload, then this will disable it.
+     *
+     * @memberof workbox-navigation-preload
+     */
+    function disable() {
+      if (isSupported()) {
+        self.addEventListener('activate', event => {
+          event.waitUntil(self.registration.navigationPreload.disable().then(() => {
+            {
+              logger_js.logger.log(`Navigation preload is disabled.`);
+            }
+          }));
+        });
+      } else {
+        {
+          logger_js.logger.log(`Navigation preload is not supported in this browser.`);
+        }
+      }
+    }
+
+    /*
+      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.
+    */
+    /**
+     * If the browser supports Navigation Preload, then this will enable it.
+     *
+     * @param {string} [headerValue] Optionally, allows developers to
+     * [override](https://developers.google.com/web/updates/2017/02/navigation-preload#changing_the_header)
+     * the value of the `Service-Worker-Navigation-Preload` header which will be
+     * sent to the server when making the navigation request.
+     *
+     * @memberof workbox-navigation-preload
+     */
+    function enable(headerValue) {
+      if (isSupported()) {
+        self.addEventListener('activate', event => {
+          event.waitUntil(self.registration.navigationPreload.enable().then(() => {
+            // Defaults to Service-Worker-Navigation-Preload: true if not set.
+            if (headerValue) {
+              void self.registration.navigationPreload.setHeaderValue(headerValue);
+            }
+            {
+              logger_js.logger.log(`Navigation preload is enabled.`);
+            }
+          }));
+        });
+      } else {
+        {
+          logger_js.logger.log(`Navigation preload is not supported in this browser.`);
+        }
+      }
+    }
+
+    exports.disable = disable;
+    exports.enable = enable;
+    exports.isSupported = isSupported;
+
+    return exports;
+
+})({}, workbox.core._private);
+//# sourceMappingURL=workbox-navigation-preload.dev.js.map

pwa/node_modules/workbox-navigation-preload/build/workbox-navigation-preload.prod.js

@@ -0,0 +1,2 @@
+this.workbox=this.workbox||{},this.workbox.navigationPreload=function(t){"use strict";try{self["workbox:navigation-preload:7.3.0"]&&_()}catch(t){}function e(){return Boolean(self.registration&&self.registration.navigationPreload)}return t.disable=function(){e()&&self.addEventListener("activate",(t=>{t.waitUntil(self.registration.navigationPreload.disable().then((()=>{})))}))},t.enable=function(t){e()&&self.addEventListener("activate",(e=>{e.waitUntil(self.registration.navigationPreload.enable().then((()=>{t&&self.registration.navigationPreload.setHeaderValue(t)})))}))},t.isSupported=e,t}({});
+//# sourceMappingURL=workbox-navigation-preload.prod.js.map

pwa/node_modules/workbox-navigation-preload/build/workbox-navigation-preload.prod.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"workbox-navigation-preload.prod.js","sources":["../_version.js","../isSupported.js","../disable.js","../enable.js"],"sourcesContent":["\"use strict\";\n// @ts-ignore\ntry {\n    self['workbox:navigation-preload:7.3.0'] && _();\n}\ncatch (e) { }\n","/*\n  Copyright 2018 Google LLC\n\n  Use of this source code is governed by an MIT-style\n  license that can be found in the LICENSE file or at\n  https://opensource.org/licenses/MIT.\n*/\nimport './_version.js';\n/**\n * @return {boolean} Whether or not the current browser supports enabling\n * navigation preload.\n *\n * @memberof workbox-navigation-preload\n */\nfunction isSupported() {\n    return Boolean(self.registration && self.registration.navigationPreload);\n}\nexport { isSupported };\n","/*\n  Copyright 2018 Google LLC\n\n  Use of this source code is governed by an MIT-style\n  license that can be found in the LICENSE file or at\n  https://opensource.org/licenses/MIT.\n*/\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { isSupported } from './isSupported.js';\nimport './_version.js';\n/**\n * If the browser supports Navigation Preload, then this will disable it.\n *\n * @memberof workbox-navigation-preload\n */\nfunction disable() {\n    if (isSupported()) {\n        self.addEventListener('activate', (event) => {\n            event.waitUntil(self.registration.navigationPreload.disable().then(() => {\n                if (process.env.NODE_ENV !== 'production') {\n                    logger.log(`Navigation preload is disabled.`);\n                }\n            }));\n        });\n    }\n    else {\n        if (process.env.NODE_ENV !== 'production') {\n            logger.log(`Navigation preload is not supported in this browser.`);\n        }\n    }\n}\nexport { disable };\n","/*\n  Copyright 2018 Google LLC\n\n  Use of this source code is governed by an MIT-style\n  license that can be found in the LICENSE file or at\n  https://opensource.org/licenses/MIT.\n*/\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { isSupported } from './isSupported.js';\nimport './_version.js';\n/**\n * If the browser supports Navigation Preload, then this will enable it.\n *\n * @param {string} [headerValue] Optionally, allows developers to\n * [override](https://developers.google.com/web/updates/2017/02/navigation-preload#changing_the_header)\n * the value of the `Service-Worker-Navigation-Preload` header which will be\n * sent to the server when making the navigation request.\n *\n * @memberof workbox-navigation-preload\n */\nfunction enable(headerValue) {\n    if (isSupported()) {\n        self.addEventListener('activate', (event) => {\n            event.waitUntil(self.registration.navigationPreload.enable().then(() => {\n                // Defaults to Service-Worker-Navigation-Preload: true if not set.\n                if (headerValue) {\n                    void self.registration.navigationPreload.setHeaderValue(headerValue);\n                }\n                if (process.env.NODE_ENV !== 'production') {\n                    logger.log(`Navigation preload is enabled.`);\n                }\n            }));\n        });\n    }\n    else {\n        if (process.env.NODE_ENV !== 'production') {\n            logger.log(`Navigation preload is not supported in this browser.`);\n        }\n    }\n}\nexport { enable };\n"],"names":["self","_","e","isSupported","Boolean","registration","navigationPreload","addEventListener","event","waitUntil","disable","then","headerValue","enable","setHeaderValue"],"mappings":"sFAEA,IACIA,KAAK,qCAAuCC,GAChD,CACA,MAAOC,GAAG,CCSV,SAASC,IACL,OAAOC,QAAQJ,KAAKK,cAAgBL,KAAKK,aAAaC,kBAC1D,kBCDA,WACQH,KACAH,KAAKO,iBAAiB,YAAaC,IAC/BA,EAAMC,UAAUT,KAAKK,aAAaC,kBAAkBI,UAAUC,MAAK,SAIhE,GAQf,WCVA,SAAgBC,GACRT,KACAH,KAAKO,iBAAiB,YAAaC,IAC/BA,EAAMC,UAAUT,KAAKK,aAAaC,kBAAkBO,SAASF,MAAK,KAE1DC,GACKZ,KAAKK,aAAaC,kBAAkBQ,eAAeF,EAC5D,IAID,GAQf"}