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/lib/no-work-result.d.ts

@@ -0,0 +1,46 @@
+import LazyResult from './lazy-result.js'
+import { SourceMap } from './postcss.js'
+import Processor from './processor.js'
+import Result, { Message, ResultOptions } from './result.js'
+import Root from './root.js'
+import Warning from './warning.js'
+
+declare namespace NoWorkResult {
+   
+  export { NoWorkResult_ as default }
+}
+
+/**
+ * A Promise proxy for the result of PostCSS transformations.
+ * This lazy result instance doesn't parse css unless `NoWorkResult#root` or `Result#root`
+ * are accessed. See the example below for details.
+ * A `NoWork` instance is returned by `Processor#process` ONLY when no plugins defined.
+ *
+ * ```js
+ * const noWorkResult = postcss().process(css) // No plugins are defined.
+ *                                             // CSS is not parsed
+ * let root = noWorkResult.root // now css is parsed because we accessed the root
+ * ```
+ */
+declare class NoWorkResult_ implements LazyResult<Root> {
+  catch: Promise<Result<Root>>['catch']
+  finally: Promise<Result<Root>>['finally']
+  then: Promise<Result<Root>>['then']
+  get content(): string
+  get css(): string
+  get map(): SourceMap
+  get messages(): Message[]
+  get opts(): ResultOptions
+  get processor(): Processor
+  get root(): Root
+  get [Symbol.toStringTag](): string
+  constructor(processor: Processor, css: string, opts: ResultOptions)
+  async(): Promise<Result<Root>>
+  sync(): Result<Root>
+  toString(): string
+  warnings(): Warning[]
+}
+
+declare class NoWorkResult extends NoWorkResult_ {}
+
+export = NoWorkResult