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/vocabularies/jtd/enum.js

@@ -0,0 +1,43 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const codegen_1 = require("../../compile/codegen");
+const metadata_1 = require("./metadata");
+const nullable_1 = require("./nullable");
+const error = {
+    message: "must be equal to one of the allowed values",
+    params: ({ schemaCode }) => (0, codegen_1._) `{allowedValues: ${schemaCode}}`,
+};
+const def = {
+    keyword: "enum",
+    schemaType: "array",
+    error,
+    code(cxt) {
+        (0, metadata_1.checkMetadata)(cxt);
+        const { gen, data, schema, schemaValue, parentSchema, it } = cxt;
+        if (schema.length === 0)
+            throw new Error("enum must have non-empty array");
+        if (schema.length !== new Set(schema).size)
+            throw new Error("enum items must be unique");
+        let valid;
+        const isString = (0, codegen_1._) `typeof ${data} == "string"`;
+        if (schema.length >= it.opts.loopEnum) {
+            let cond;
+            [valid, cond] = (0, nullable_1.checkNullable)(cxt, isString);
+            gen.if(cond, loopEnum);
+        }
+        else {
+            /* istanbul ignore if */
+            if (!Array.isArray(schema))
+                throw new Error("ajv implementation error");
+            valid = (0, codegen_1.and)(isString, (0, codegen_1.or)(...schema.map((value) => (0, codegen_1._) `${data} === ${value}`)));
+            if (parentSchema.nullable)
+                valid = (0, codegen_1.or)((0, codegen_1._) `${data} === null`, valid);
+        }
+        cxt.pass(valid);
+        function loopEnum() {
+            gen.forOf("v", schemaValue, (v) => gen.if((0, codegen_1._) `${valid} = ${data} === ${v}`, () => gen.break()));
+        }
+    },
+};
+exports.default = def;
+//# sourceMappingURL=enum.js.map