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/postcss/package.json

@@ -0,0 +1,88 @@
+{
+  "name": "postcss",
+  "version": "8.5.8",
+  "description": "Tool for transforming styles with JS plugins",
+  "engines": {
+    "node": "^10 || ^12 || >=14"
+  },
+  "exports": {
+    ".": {
+      "import": "./lib/postcss.mjs",
+      "require": "./lib/postcss.js"
+    },
+    "./lib/at-rule": "./lib/at-rule.js",
+    "./lib/comment": "./lib/comment.js",
+    "./lib/container": "./lib/container.js",
+    "./lib/css-syntax-error": "./lib/css-syntax-error.js",
+    "./lib/declaration": "./lib/declaration.js",
+    "./lib/fromJSON": "./lib/fromJSON.js",
+    "./lib/input": "./lib/input.js",
+    "./lib/lazy-result": "./lib/lazy-result.js",
+    "./lib/no-work-result": "./lib/no-work-result.js",
+    "./lib/list": "./lib/list.js",
+    "./lib/map-generator": "./lib/map-generator.js",
+    "./lib/node": "./lib/node.js",
+    "./lib/parse": "./lib/parse.js",
+    "./lib/parser": "./lib/parser.js",
+    "./lib/postcss": "./lib/postcss.js",
+    "./lib/previous-map": "./lib/previous-map.js",
+    "./lib/processor": "./lib/processor.js",
+    "./lib/result": "./lib/result.js",
+    "./lib/root": "./lib/root.js",
+    "./lib/rule": "./lib/rule.js",
+    "./lib/stringifier": "./lib/stringifier.js",
+    "./lib/stringify": "./lib/stringify.js",
+    "./lib/symbols": "./lib/symbols.js",
+    "./lib/terminal-highlight": "./lib/terminal-highlight.js",
+    "./lib/tokenize": "./lib/tokenize.js",
+    "./lib/warn-once": "./lib/warn-once.js",
+    "./lib/warning": "./lib/warning.js",
+    "./package.json": "./package.json"
+  },
+  "main": "./lib/postcss.js",
+  "types": "./lib/postcss.d.ts",
+  "keywords": [
+    "css",
+    "postcss",
+    "rework",
+    "preprocessor",
+    "parser",
+    "source map",
+    "transform",
+    "manipulation",
+    "transpiler"
+  ],
+  "funding": [
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/postcss/"
+    },
+    {
+      "type": "tidelift",
+      "url": "https://tidelift.com/funding/github/npm/postcss"
+    },
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/ai"
+    }
+  ],
+  "author": "Andrey Sitnik <andrey@sitnik.ru>",
+  "license": "MIT",
+  "homepage": "https://postcss.org/",
+  "repository": "postcss/postcss",
+  "bugs": {
+    "url": "https://github.com/postcss/postcss/issues"
+  },
+  "dependencies": {
+    "nanoid": "^3.3.11",
+    "picocolors": "^1.1.1",
+    "source-map-js": "^1.2.1"
+  },
+  "browser": {
+    "./lib/terminal-highlight": false,
+    "source-map-js": false,
+    "path": false,
+    "url": false,
+    "fs": false
+  }
+}