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/shebang-command/package.json

@@ -0,0 +1,34 @@
+{
+	"name": "shebang-command",
+	"version": "2.0.0",
+	"description": "Get the command from a shebang",
+	"license": "MIT",
+	"repository": "kevva/shebang-command",
+	"author": {
+		"name": "Kevin Mårtensson",
+		"email": "kevinmartensson@gmail.com",
+		"url": "github.com/kevva"
+	},
+	"engines": {
+		"node": ">=8"
+	},
+	"scripts": {
+		"test": "xo && ava"
+	},
+	"files": [
+		"index.js"
+	],
+	"keywords": [
+		"cmd",
+		"command",
+		"parse",
+		"shebang"
+	],
+	"dependencies": {
+		"shebang-regex": "^3.0.0"
+	},
+	"devDependencies": {
+		"ava": "^2.3.0",
+		"xo": "^0.24.0"
+	}
+}