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/@babel/template/lib/index.js

@@ -0,0 +1,23 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.statements = exports.statement = exports.smart = exports.program = exports.expression = exports.default = void 0;
+var formatters = require("./formatters.js");
+var _builder = require("./builder.js");
+const smart = exports.smart = (0, _builder.default)(formatters.smart);
+const statement = exports.statement = (0, _builder.default)(formatters.statement);
+const statements = exports.statements = (0, _builder.default)(formatters.statements);
+const expression = exports.expression = (0, _builder.default)(formatters.expression);
+const program = exports.program = (0, _builder.default)(formatters.program);
+var _default = exports.default = Object.assign(smart.bind(undefined), {
+  smart,
+  statement,
+  statements,
+  expression,
+  program,
+  ast: smart.ast
+});
+
+//# sourceMappingURL=index.js.map