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/tempy/index.d.ts

@@ -0,0 +1,113 @@
+/// <reference types="node"/>
+import {MergeExclusive, TypedArray} from 'type-fest';
+
+declare namespace tempy {
+	type FileOptions = MergeExclusive<
+	{
+		/**
+			File extension.
+
+			Mutually exclusive with the `name` option.
+
+			_You usually won't need this option. Specify it only when actually needed._
+			*/
+		readonly extension?: string;
+	},
+	{
+		/**
+			Filename.
+
+			Mutually exclusive with the `extension` option.
+
+			_You usually won't need this option. Specify it only when actually needed._
+			*/
+		readonly name?: string;
+	}
+	>;
+
+	type DirectoryOptions = {
+		/**
+		_You usually won't need this option. Specify it only when actually needed._
+
+		Directory prefix.
+
+		Useful for testing by making it easier to identify cache directories that are created.
+		*/
+		readonly prefix?: string;
+	};
+}
+
+declare const tempy: {
+	/**
+	Get a temporary file path you can write to.
+
+	@example
+	```
+	import tempy = require('tempy');
+
+	tempy.file();
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/4f504b9edb5ba0e89451617bf9f971dd'
+
+	tempy.file({extension: 'png'});
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/a9fb0decd08179eb6cf4691568aa2018.png'
+
+	tempy.file({name: 'unicorn.png'});
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/f7f62bfd4e2a05f1589947647ed3f9ec/unicorn.png'
+
+	tempy.directory();
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/2f3d094aec2cb1b93bb0f4cffce5ebd6'
+	```
+	*/
+	file: (options?: tempy.FileOptions) => string;
+
+	/**
+	Get a temporary directory path. The directory is created for you.
+
+	@example
+	```
+	import tempy = require('tempy');
+
+	tempy.directory();
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/2f3d094aec2cb1b93bb0f4cffce5ebd6'
+
+	tempy.directory({prefix: 'a'});
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/name_3c085674ad31223b9653c88f725d6b41'
+	```
+	*/
+	directory: (options?: tempy.DirectoryOptions) => string;
+
+	/**
+	Write data to a random temp file.
+
+	@example
+	```
+	import tempy = require('tempy');
+
+	await tempy.write('🦄');
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/2f3d094aec2cb1b93bb0f4cffce5ebd6'
+	```
+	*/
+	write: (fileContent: string | Buffer | TypedArray | DataView | NodeJS.ReadableStream, options?: tempy.FileOptions) => Promise<string>;
+
+	/**
+	Synchronously write data to a random temp file.
+
+	@example
+	```
+	import tempy = require('tempy');
+
+	tempy.writeSync('🦄');
+	//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/2f3d094aec2cb1b93bb0f4cffce5ebd6'
+	```
+	*/
+	writeSync: (fileContent: string | Buffer | TypedArray | DataView, options?: tempy.FileOptions) => string;
+
+	/**
+	Get the root temporary directory path.
+
+	For example: `/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T`.
+	*/
+	readonly root: string;
+};
+
+export = tempy;