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/ajv/dist/jtd.js

@@ -0,0 +1,72 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.MissingRefError = exports.ValidationError = exports.CodeGen = exports.Name = exports.nil = exports.stringify = exports.str = exports._ = exports.KeywordCxt = exports.Ajv = void 0;
+const core_1 = require("./core");
+const jtd_1 = require("./vocabularies/jtd");
+const jtd_schema_1 = require("./refs/jtd-schema");
+const serialize_1 = require("./compile/jtd/serialize");
+const parse_1 = require("./compile/jtd/parse");
+const META_SCHEMA_ID = "JTD-meta-schema";
+class Ajv extends core_1.default {
+    constructor(opts = {}) {
+        super({
+            ...opts,
+            jtd: true,
+        });
+    }
+    _addVocabularies() {
+        super._addVocabularies();
+        this.addVocabulary(jtd_1.default);
+    }
+    _addDefaultMetaSchema() {
+        super._addDefaultMetaSchema();
+        if (!this.opts.meta)
+            return;
+        this.addMetaSchema(jtd_schema_1.default, META_SCHEMA_ID, false);
+    }
+    defaultMeta() {
+        return (this.opts.defaultMeta =
+            super.defaultMeta() || (this.getSchema(META_SCHEMA_ID) ? META_SCHEMA_ID : undefined));
+    }
+    compileSerializer(schema) {
+        const sch = this._addSchema(schema);
+        return sch.serialize || this._compileSerializer(sch);
+    }
+    compileParser(schema) {
+        const sch = this._addSchema(schema);
+        return (sch.parse || this._compileParser(sch));
+    }
+    _compileSerializer(sch) {
+        serialize_1.default.call(this, sch, sch.schema.definitions || {});
+        /* istanbul ignore if */
+        if (!sch.serialize)
+            throw new Error("ajv implementation error");
+        return sch.serialize;
+    }
+    _compileParser(sch) {
+        parse_1.default.call(this, sch, sch.schema.definitions || {});
+        /* istanbul ignore if */
+        if (!sch.parse)
+            throw new Error("ajv implementation error");
+        return sch.parse;
+    }
+}
+exports.Ajv = Ajv;
+module.exports = exports = Ajv;
+module.exports.Ajv = Ajv;
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = Ajv;
+var validate_1 = require("./compile/validate");
+Object.defineProperty(exports, "KeywordCxt", { enumerable: true, get: function () { return validate_1.KeywordCxt; } });
+var codegen_1 = require("./compile/codegen");
+Object.defineProperty(exports, "_", { enumerable: true, get: function () { return codegen_1._; } });
+Object.defineProperty(exports, "str", { enumerable: true, get: function () { return codegen_1.str; } });
+Object.defineProperty(exports, "stringify", { enumerable: true, get: function () { return codegen_1.stringify; } });
+Object.defineProperty(exports, "nil", { enumerable: true, get: function () { return codegen_1.nil; } });
+Object.defineProperty(exports, "Name", { enumerable: true, get: function () { return codegen_1.Name; } });
+Object.defineProperty(exports, "CodeGen", { enumerable: true, get: function () { return codegen_1.CodeGen; } });
+var validation_error_1 = require("./runtime/validation_error");
+Object.defineProperty(exports, "ValidationError", { enumerable: true, get: function () { return validation_error_1.default; } });
+var ref_error_1 = require("./compile/ref_error");
+Object.defineProperty(exports, "MissingRefError", { enumerable: true, get: function () { return ref_error_1.default; } });
+//# sourceMappingURL=jtd.js.map