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/dist/chunks/index.CqYx2Nsr.js

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+import process$1 from 'process';
+import fs from 'node:fs';
+import fsp from 'node:fs/promises';
+import a from 'node:path';
+import process from 'node:process';
+import { existsSync } from 'fs';
+import { resolve } from 'path';
+import { x } from 'tinyexec';
+
+const AGENTS = [
+  "npm",
+  "yarn",
+  "yarn@berry",
+  "pnpm",
+  "pnpm@6",
+  "bun"
+];
+const LOCKS = {
+  "bun.lockb": "bun",
+  "pnpm-lock.yaml": "pnpm",
+  "yarn.lock": "yarn",
+  "package-lock.json": "npm",
+  "npm-shrinkwrap.json": "npm"
+};
+
+async function detect({ cwd, onUnknown } = {}) {
+  for (const directory of lookup(cwd)) {
+    for (const lock of Object.keys(LOCKS)) {
+      if (await fileExists(a.join(directory, lock))) {
+        const name = LOCKS[lock];
+        const result2 = await parsePackageJson(a.join(directory, "package.json"), onUnknown);
+        if (result2)
+          return result2;
+        else
+          return { name, agent: name };
+      }
+    }
+    const result = await parsePackageJson(a.join(directory, "package.json"), onUnknown);
+    if (result)
+      return result;
+  }
+  return null;
+}
+function* lookup(cwd = process.cwd()) {
+  let directory = a.resolve(cwd);
+  const { root } = a.parse(directory);
+  while (directory && directory !== root) {
+    yield directory;
+    directory = a.dirname(directory);
+  }
+}
+async function parsePackageJson(filepath, onUnknown) {
+  if (!filepath || !await fileExists(filepath))
+    return null;
+  try {
+    const pkg = JSON.parse(fs.readFileSync(filepath, "utf8"));
+    let agent;
+    if (typeof pkg.packageManager === "string") {
+      const [name, ver] = pkg.packageManager.replace(/^\^/, "").split("@");
+      let version = ver;
+      if (name === "yarn" && Number.parseInt(ver) > 1) {
+        agent = "yarn@berry";
+        version = "berry";
+        return { name, agent, version };
+      } else if (name === "pnpm" && Number.parseInt(ver) < 7) {
+        agent = "pnpm@6";
+        return { name, agent, version };
+      } else if (AGENTS.includes(name)) {
+        agent = name;
+        return { name, agent, version };
+      } else {
+        return onUnknown?.(pkg.packageManager) ?? null;
+      }
+    }
+  } catch {
+  }
+  return null;
+}
+async function fileExists(filePath) {
+  try {
+    const stats = await fsp.stat(filePath);
+    if (stats.isFile()) {
+      return true;
+    }
+  } catch {
+  }
+  return false;
+}
+
+// src/detect.ts
+async function detectPackageManager(cwd = process$1.cwd()) {
+  const result = await detect({
+    cwd,
+    onUnknown(packageManager) {
+      console.warn("[@antfu/install-pkg] Unknown packageManager:", packageManager);
+      return void 0;
+    }
+  });
+  return result?.agent || null;
+}
+async function installPackage(names, options = {}) {
+  const detectedAgent = options.packageManager || await detectPackageManager(options.cwd) || "npm";
+  const [agent] = detectedAgent.split("@");
+  if (!Array.isArray(names))
+    names = [names];
+  const args = options.additionalArgs || [];
+  if (options.preferOffline) {
+    if (detectedAgent === "yarn@berry")
+      args.unshift("--cached");
+    else
+      args.unshift("--prefer-offline");
+  }
+  if (agent === "pnpm" && existsSync(resolve(options.cwd ?? process$1.cwd(), "pnpm-workspace.yaml")))
+    args.unshift("-w");
+  return x(
+    agent,
+    [
+      agent === "yarn" ? "add" : "install",
+      options.dev ? "-D" : "",
+      ...args,
+      ...names
+    ].filter(Boolean),
+    {
+      nodeOptions: {
+        stdio: options.silent ? "ignore" : "inherit",
+        cwd: options.cwd
+      },
+      throwOnError: true
+    }
+  );
+}
+
+export { detectPackageManager, installPackage };