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/strip-comments/index.js

@@ -0,0 +1,116 @@
+/*!
+ * strip-comments <https://github.com/jonschlinkert/strip-comments>
+ * Copyright (c) 2014-present, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+'use strict';
+
+const compile = require('./lib/compile');
+const parse = require('./lib/parse');
+
+/**
+ * Strip all code comments from the given `input`, including protected
+ * comments that start with `!`, unless disabled by setting `options.keepProtected`
+ * to true.
+ *
+ * ```js
+ * const str = strip('const foo = "bar";// this is a comment\n /* me too *\/');
+ * console.log(str);
+ * // => 'const foo = "bar";'
+ * ```
+ * @name  strip
+ * @param  {String} `input` string from which to strip comments
+ * @param  {Object} `options` optional options, passed to [extract-comments][extract-comments]
+ * @option {Boolean} [options] `line` if `false` strip only block comments, default `true`
+ * @option {Boolean} [options] `block` if `false` strip only line comments, default `true`
+ * @option {Boolean} [options] `keepProtected` Keep ignored comments (e.g. `/*!` and `//!`)
+ * @option {Boolean} [options] `preserveNewlines` Preserve newlines after comments are stripped
+ * @return {String} modified input
+ * @api public
+ */
+
+const strip = module.exports = (input, options) => {
+  const opts = { ...options, block: true, line: true };
+  return compile(parse(input, opts), opts);
+};
+
+/**
+ * Strip only block comments.
+ *
+ * ```js
+ * const strip = require('..');
+ * const str = strip.block('const foo = "bar";// this is a comment\n /* me too *\/');
+ * console.log(str);
+ * // => 'const foo = "bar";// this is a comment'
+ * ```
+ * @name  .block
+ * @param  {String} `input` string from which to strip comments
+ * @param  {Object} `options` pass `opts.keepProtected: true` to keep ignored comments (e.g. `/*!`)
+ * @return {String} modified string
+ * @api public
+ */
+
+strip.block = (input, options) => {
+  const opts = { ...options, block: true };
+  return compile(parse(input, opts), opts);
+};
+
+/**
+ * Strip only line comments.
+ *
+ * ```js
+ * const str = strip.line('const foo = "bar";// this is a comment\n /* me too *\/');
+ * console.log(str);
+ * // => 'const foo = "bar";\n/* me too *\/'
+ * ```
+ * @name  .line
+ * @param  {String} `input` string from which to strip comments
+ * @param  {Object} `options` pass `opts.keepProtected: true` to keep ignored comments (e.g. `//!`)
+ * @return {String} modified string
+ * @api public
+ */
+
+strip.line = (input, options) => {
+  const opts = { ...options, line: true };
+  return compile(parse(input, opts), opts);
+};
+
+/**
+ * Strip the first comment from the given `input`. Or, if `opts.keepProtected` is true,
+ * the first non-protected comment will be stripped.
+ *
+ * ```js
+ * const output = strip.first(input, { keepProtected: true });
+ * console.log(output);
+ * // => '//! first comment\nfoo; '
+ * ```
+ * @name .first
+ * @param {String} `input`
+ * @param {Object} `options` pass `opts.keepProtected: true` to keep comments with `!`
+ * @return {String}
+ * @api public
+ */
+
+strip.first = (input, options) => {
+  const opts = { ...options, block: true, line: true, first: true };
+  return compile(parse(input, opts), opts);
+};
+
+/**
+ * Parses a string and returns a basic CST (Concrete Syntax Tree).
+ *
+ * ```js
+ * const strip = require('..');
+ * const str = strip.block('const foo = "bar";// this is a comment\n /* me too *\/');
+ * console.log(str);
+ * // => 'const foo = "bar";// this is a comment'
+ * ```
+ * @name  .block
+ * @param  {String} `input` string from which to strip comments
+ * @param  {Object} `options` pass `opts.keepProtected: true` to keep ignored comments (e.g. `/*!`)
+ * @return {String} modified string
+ * @api public
+ */
+
+strip.parse = parse;