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/@vitest/snapshot/dist/index.d.ts

@@ -0,0 +1,110 @@
+import { S as SnapshotStateOptions, a as SnapshotMatchOptions, b as SnapshotResult, R as RawSnapshotInfo } from './rawSnapshot-CPNkto81.js';
+export { c as SnapshotData, d as SnapshotSerializer, e as SnapshotSummary, f as SnapshotUpdateState, U as UncheckedSnapshot } from './rawSnapshot-CPNkto81.js';
+import { S as SnapshotEnvironment } from './environment-Ddx0EDtY.js';
+import { Plugin, Plugins } from '@vitest/pretty-format';
+
+interface ParsedStack {
+    method: string;
+    file: string;
+    line: number;
+    column: number;
+}
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+interface SnapshotReturnOptions {
+    actual: string;
+    count: number;
+    expected?: string;
+    key: string;
+    pass: boolean;
+}
+interface SaveStatus {
+    deleted: boolean;
+    saved: boolean;
+}
+declare class SnapshotState {
+    testFilePath: string;
+    snapshotPath: string;
+    private _counters;
+    private _dirty;
+    private _updateSnapshot;
+    private _snapshotData;
+    private _initialData;
+    private _inlineSnapshots;
+    private _inlineSnapshotStacks;
+    private _rawSnapshots;
+    private _uncheckedKeys;
+    private _snapshotFormat;
+    private _environment;
+    private _fileExists;
+    added: number;
+    expand: boolean;
+    matched: number;
+    unmatched: number;
+    updated: number;
+    private constructor();
+    static create(testFilePath: string, options: SnapshotStateOptions): Promise<SnapshotState>;
+    get environment(): SnapshotEnvironment;
+    markSnapshotsAsCheckedForTest(testName: string): void;
+    protected _inferInlineSnapshotStack(stacks: ParsedStack[]): ParsedStack | null;
+    private _addSnapshot;
+    clear(): void;
+    save(): Promise<SaveStatus>;
+    getUncheckedCount(): number;
+    getUncheckedKeys(): Array<string>;
+    removeUncheckedKeys(): void;
+    match({ testName, received, key, inlineSnapshot, isInline, error, rawSnapshot, }: SnapshotMatchOptions): SnapshotReturnOptions;
+    pack(): Promise<SnapshotResult>;
+}
+
+interface AssertOptions {
+    received: unknown;
+    filepath?: string;
+    name?: string;
+    message?: string;
+    isInline?: boolean;
+    properties?: object;
+    inlineSnapshot?: string;
+    error?: Error;
+    errorMessage?: string;
+    rawSnapshot?: RawSnapshotInfo;
+}
+interface SnapshotClientOptions {
+    isEqual?: (received: unknown, expected: unknown) => boolean;
+}
+declare class SnapshotClient {
+    private options;
+    filepath?: string;
+    name?: string;
+    snapshotState: SnapshotState | undefined;
+    snapshotStateMap: Map<string, SnapshotState>;
+    constructor(options?: SnapshotClientOptions);
+    startCurrentRun(filepath: string, name: string, options: SnapshotStateOptions): Promise<void>;
+    getSnapshotState(filepath: string): SnapshotState;
+    clearTest(): void;
+    skipTestSnapshots(name: string): void;
+    assert(options: AssertOptions): void;
+    assertRaw(options: AssertOptions): Promise<void>;
+    finishCurrentRun(): Promise<SnapshotResult | null>;
+    clear(): void;
+}
+
+declare function stripSnapshotIndentation(inlineSnapshot: string): string;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+declare function addSerializer(plugin: Plugin): void;
+declare function getSerializers(): Plugins;
+
+export { SnapshotClient, SnapshotMatchOptions, SnapshotResult, SnapshotState, SnapshotStateOptions, addSerializer, getSerializers, stripSnapshotIndentation };