Add PWA manifest, icons and offline service worker to the admin app

- Static web app manifest (standalone, brand-token colours) with 192/512
  "any" icons and a 512 maskable icon, generated as real PNGs by
  admin/scripts/generate-icons.mjs (zlib only, no network).
- Hand-written public/sw.js: precaches the shell on install, prunes stale
  caches on activate, falls back to the cached index.html for offline
  navigations, serves same-origin static assets cache-first; never
  handles cross-origin or non-GET requests.
- registerServiceWorker() registers /sw.js only in production builds and
  logs on failure; called from main.tsx. index.html links the manifest,
  theme colour and apple-touch-icon.
- Vitest coverage for manifest installability, icon PNG dimensions, the
  worker's install/activate/fetch behaviour and the production guard.

Task: 96ab3c0b-7554-4098-8af1-2be7815f8929

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

admin/index.html

@@ -3,6 +3,9 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover" />
+    <meta name="theme-color" content="#3b3ab8" />
+    <link rel="manifest" href="/manifest.webmanifest" />
+    <link rel="apple-touch-icon" href="/icons/icon-192.png" />
     <title>NestQuest Admin</title>
   </head>
   <body>

admin/public/manifest.webmanifest

@@ -0,0 +1,14 @@
+{
+  "name": "NestQuest Admin",
+  "short_name": "NestQuest",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#f4f4f6",
+  "theme_color": "#3b3ab8",
+  "icons": [
+    { "src": "/icons/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any" },
+    { "src": "/icons/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any" },
+    { "src": "/icons/icon-maskable-512.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}

admin/public/sw.js

@@ -0,0 +1,77 @@
+/* NestQuest Admin service worker — hand-written, served from the site root.
+   Precaches the app shell, serves static assets cache-first, and falls back
+   to the cached shell for navigations when offline. Only same-origin GET
+   requests are handled; cross-origin requests (Authentik, the API host) are
+   never intercepted or cached. */
+
+const VERSION = "v1";
+const SHELL_CACHE = `nestquest-admin-shell-${VERSION}`;
+const RUNTIME_CACHE = `nestquest-admin-runtime-${VERSION}`;
+const CURRENT_CACHES = [SHELL_CACHE, RUNTIME_CACHE];
+
+const SHELL_URLS = [
+  "/",
+  "/index.html",
+  "/manifest.webmanifest",
+  "/icons/icon-192.png",
+  "/icons/icon-512.png",
+  "/icons/icon-maskable-512.png",
+];
+
+// Request destinations treated as static assets (cache-first). Anything else
+// same-origin (e.g. API calls) goes straight to the network.
+const STATIC_DESTINATIONS = ["script", "style", "image", "font", "manifest"];
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(
+    caches
+      .open(SHELL_CACHE)
+      .then((cache) => cache.addAll(SHELL_URLS))
+      .then(() => self.skipWaiting()),
+  );
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then((keys) =>
+        Promise.all(
+          keys.filter((key) => !CURRENT_CACHES.includes(key)).map((key) => caches.delete(key)),
+        ),
+      )
+      .then(() => self.clients.claim()),
+  );
+});
+
+self.addEventListener("fetch", (event) => {
+  const request = event.request;
+  if (request.method !== "GET") return;
+  if (new URL(request.url).origin !== self.location.origin) return;
+
+  if (request.mode === "navigate") {
+    event.respondWith(
+      fetch(request).catch(() =>
+        caches.match("/index.html", { cacheName: SHELL_CACHE }).then(
+          (cached) => cached || Response.error(),
+        ),
+      ),
+    );
+    return;
+  }
+
+  if (STATIC_DESTINATIONS.includes(request.destination)) {
+    event.respondWith(cacheFirst(request));
+  }
+});
+
+async function cacheFirst(request) {
+  const cached = await caches.match(request);
+  if (cached) return cached;
+  const response = await fetch(request);
+  if (response.ok && response.type === "basic") {
+    const cache = await caches.open(RUNTIME_CACHE);
+    await cache.put(request, response.clone());
+  }
+  return response;
+}

admin/scripts/generate-icons.mjs

@@ -0,0 +1,80 @@
+// Generates the committed PWA icons under public/icons/ as genuine PNGs.
+// Pure Node (zlib only) — no network, no image dependencies.
+// Run: node scripts/generate-icons.mjs
+import { writeFileSync } from "node:fs";
+import { deflateSync } from "node:zlib";
+import { fileURLToPath } from "node:url";
+
+// Brand tokens (design/tokens/nestquest-admin-tokens.css).
+const BLUE = [0x3b, 0x3a, 0xb8];
+const PURPLE = [0xa0, 0x35, 0xcc];
+const WHITE = [0xff, 0xff, 0xff];
+
+const CRC_TABLE = Array.from({ length: 256 }, (_, n) => {
+  let c = n;
+  for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
+  return c >>> 0;
+});
+
+function crc32(buf) {
+  let c = 0xffffffff;
+  for (const b of buf) c = CRC_TABLE[(c ^ b) & 0xff] ^ (c >>> 8);
+  return (c ^ 0xffffffff) >>> 0;
+}
+
+function chunk(type, data) {
+  const len = Buffer.alloc(4);
+  len.writeUInt32BE(data.length);
+  const body = Buffer.concat([Buffer.from(type, "ascii"), data]);
+  const crc = Buffer.alloc(4);
+  crc.writeUInt32BE(crc32(body));
+  return Buffer.concat([len, body, crc]);
+}
+
+function encodePng(size, pixel) {
+  const ihdr = Buffer.alloc(13);
+  ihdr.writeUInt32BE(size, 0);
+  ihdr.writeUInt32BE(size, 4);
+  ihdr[8] = 8; // bit depth
+  ihdr[9] = 2; // colour type: RGB
+  const raw = Buffer.alloc(size * (size * 3 + 1));
+  for (let y = 0; y < size; y++) {
+    const row = y * (size * 3 + 1);
+    raw[row] = 0; // filter: none
+    for (let x = 0; x < size; x++) raw.set(pixel(x, y), row + 1 + x * 3);
+  }
+  return Buffer.concat([
+    Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]),
+    chunk("IHDR", ihdr),
+    chunk("IDAT", deflateSync(raw, { level: 9 })),
+    chunk("IEND", Buffer.alloc(0)),
+  ]);
+}
+
+// Flat brand mark: diagonal blue→purple gradient with a white ring ("nest")
+// around a white dot ("quest"). `scale` shrinks the mark for the maskable
+// safe zone (inner 80% circle).
+function brandMark(size, scale) {
+  const c = size / 2;
+  const outer = size * 0.34 * scale;
+  const inner = size * 0.24 * scale;
+  const dot = size * 0.1 * scale;
+  return (x, y) => {
+    const d = Math.hypot(x + 0.5 - c, y + 0.5 - c);
+    if ((d <= outer && d >= inner) || d <= dot) return WHITE;
+    const t = (x + y) / (2 * (size - 1));
+    return BLUE.map((b, i) => Math.round(b + (PURPLE[i] - b) * t));
+  };
+}
+
+const outDir = new URL("../public/icons/", import.meta.url);
+const icons = [
+  ["icon-192.png", 192, 1],
+  ["icon-512.png", 512, 1],
+  ["icon-maskable-512.png", 512, 0.75],
+];
+for (const [name, size, scale] of icons) {
+  const path = fileURLToPath(new URL(name, outDir));
+  writeFileSync(path, encodePng(size, brandMark(size, scale)));
+  console.log(`wrote ${path}`);
+}

admin/src/main.tsx

@@ -2,9 +2,12 @@ import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import AppRoutes from "./AppRoutes";
 import "./index.css";
+import { registerServiceWorker } from "./pwa/register";
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
     <AppRoutes />
   </StrictMode>,
 );
+
+void registerServiceWorker();

admin/src/pwa/pwa.test.ts

@@ -0,0 +1,261 @@
+import { existsSync, readFileSync } from "node:fs";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { registerServiceWorker } from "./register";
+
+const adminRoot = resolve(dirname(fileURLToPath(import.meta.url)), "../..");
+const adminPath = (rel: string) => resolve(adminRoot, rel);
+const publicPath = (urlPath: string) => adminPath(`public${urlPath}`);
+
+interface ManifestIcon {
+  src: string;
+  sizes: string;
+  type: string;
+  purpose?: string;
+}
+
+const manifest = JSON.parse(readFileSync(publicPath("/manifest.webmanifest"), "utf8"));
+const icons: ManifestIcon[] = manifest.icons;
+const swSource = readFileSync(publicPath("/sw.js"), "utf8");
+
+const sizeOf = (icon: ManifestIcon) => Number(icon.sizes.split("x")[0]);
+const purposes = (icon: ManifestIcon) => (icon.purpose ?? "any").split(/\s+/);
+
+describe("web app manifest", () => {
+  it("meets the installability criteria", () => {
+    expect(manifest.name).toBe("NestQuest Admin");
+    expect(manifest.short_name).toBe("NestQuest");
+    expect(manifest.start_url).toBe("/");
+    expect(manifest.scope).toBe("/");
+    expect(manifest.display).toBe("standalone");
+    expect(manifest.background_color).toMatch(/^#[0-9a-f]{6}$/i);
+    expect(manifest.theme_color).toMatch(/^#[0-9a-f]{6}$/i);
+
+    const any = icons.filter((i) => purposes(i).includes("any"));
+    expect(any.some((i) => sizeOf(i) >= 192)).toBe(true);
+    expect(any.some((i) => sizeOf(i) >= 512)).toBe(true);
+    expect(icons.some((i) => purposes(i).includes("maskable"))).toBe(true);
+  });
+
+  it("uses the admin design token colours", () => {
+    const css = readFileSync(adminPath("src/index.css"), "utf8");
+    expect(css).toContain(`--nq-brand-blue: ${manifest.theme_color};`);
+    expect(css).toContain(`--nq-a-page: ${manifest.background_color};`);
+  });
+
+  it.each(icons.map((i) => [i.src, i] as const))(
+    "icon %s is a real PNG of its declared size",
+    (_src, icon) => {
+      const path = publicPath(icon.src);
+      expect(existsSync(path)).toBe(true);
+      const png = readFileSync(path);
+      expect([...png.subarray(0, 8)]).toEqual([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]);
+      expect(png.toString("ascii", 12, 16)).toBe("IHDR");
+      const [w, h] = icon.sizes.split("x").map(Number);
+      expect(png.readUInt32BE(16)).toBe(w);
+      expect(png.readUInt32BE(20)).toBe(h);
+      expect(icon.type).toBe("image/png");
+    },
+  );
+});
+
+describe("index.html and entry point", () => {
+  const html = readFileSync(adminPath("index.html"), "utf8");
+
+  it("links the manifest, theme colour and apple touch icon", () => {
+    expect(html).toContain('<link rel="manifest" href="/manifest.webmanifest" />');
+    expect(html).toContain(`<meta name="theme-color" content="${manifest.theme_color}" />`);
+    expect(html).toContain('<link rel="apple-touch-icon" href="/icons/icon-192.png" />');
+  });
+
+  it("main.tsx registers the service worker", () => {
+    const main = readFileSync(adminPath("src/main.tsx"), "utf8");
+    expect(main).toMatch(/import \{ registerServiceWorker \} from "\.\/pwa\/register"/);
+    expect(main).toMatch(/registerServiceWorker\(\)/);
+  });
+});
+
+// Minimal service-worker global scope: runs public/sw.js against in-memory
+// caches and a stubbed network, so handler behaviour is checked without I/O.
+function loadServiceWorker(network: (url: string) => Promise<FakeResponse>) {
+  const listeners: Record<string, (event: any) => void> = {};
+  const stores = new Map<string, Map<string, FakeResponse>>();
+  const openStore = (name: string) => {
+    if (!stores.has(name)) stores.set(name, new Map());
+    return stores.get(name)!;
+  };
+  const keyOf = (req: string | { url: string }) =>
+    new URL(typeof req === "string" ? req : req.url, "https://admin.test").href;
+  const fetchFn = vi.fn((req: string | { url: string }) => network(keyOf(req)));
+
+  const caches = {
+    open: async (name: string) => {
+      const store = openStore(name);
+      return {
+        addAll: async (urls: string[]) => {
+          for (const u of urls) store.set(keyOf(u), await network(keyOf(u)));
+        },
+        put: async (req: { url: string }, res: FakeResponse) => void store.set(keyOf(req), res),
+      };
+    },
+    keys: async () => [...stores.keys()],
+    delete: async (name: string) => stores.delete(name),
+    match: async (req: string | { url: string }, opts?: { cacheName?: string }) => {
+      const names = opts?.cacheName ? [opts.cacheName] : [...stores.keys()];
+      for (const n of names) {
+        const hit = stores.get(n)?.get(keyOf(req));
+        if (hit) return hit;
+      }
+      return undefined;
+    },
+  };
+  const self = {
+    location: new URL("https://admin.test/"),
+    addEventListener: (type: string, fn: (event: any) => void) => (listeners[type] = fn),
+    skipWaiting: vi.fn(async () => undefined),
+    clients: { claim: vi.fn(async () => undefined) },
+  };
+  const ResponseStub = { error: () => new FakeResponse("", false, "error") };
+  new Function("self", "caches", "fetch", "Response", swSource)(self, caches, fetchFn, ResponseStub);
+
+  const dispatch = async (type: string, init: object = {}) => {
+    let pending: Promise<unknown> | undefined;
+    const event = {
+      ...init,
+      waitUntil: (p: Promise<unknown>) => (pending = p),
+      respondWith: (p: Promise<unknown>) => (pending = p),
+    };
+    listeners[type](event);
+    return { responded: pending !== undefined, result: await pending };
+  };
+  return { listeners, stores, self, fetchFn, dispatch, openStore };
+}
+
+class FakeResponse {
+  constructor(
+    readonly body: string,
+    readonly ok = true,
+    readonly type = "basic",
+  ) {}
+  clone() {
+    return new FakeResponse(this.body, this.ok, this.type);
+  }
+}
+
+const request = (url: string, extra: object = {}) => ({
+  url: new URL(url, "https://admin.test").href,
+  method: "GET",
+  mode: "cors",
+  destination: "",
+  ...extra,
+});
+
+describe("service worker (public/sw.js)", () => {
+  it("is a static asset served from the site root", () => {
+    expect(existsSync(publicPath("/sw.js"))).toBe(true);
+    expect(swSource).toMatch(/const SHELL_CACHE = /);
+    expect(swSource).toMatch(/addEventListener\("install"/);
+    expect(swSource).toMatch(/addEventListener\("activate"/);
+    expect(swSource).toMatch(/addEventListener\("fetch"/);
+  });
+
+  it("precaches the shell on install, prunes stale caches on activate", async () => {
+    const sw = loadServiceWorker(async (url) => new FakeResponse(`net:${url}`));
+    sw.openStore("nestquest-admin-shell-v0");
+
+    await sw.dispatch("install");
+    expect(sw.self.skipWaiting).toHaveBeenCalled();
+    const precached = [...sw.stores.values()].flatMap((s) => [...s.keys()]);
+    for (const path of ["/", "/index.html", "/manifest.webmanifest", ...icons.map((i) => i.src)]) {
+      expect(precached).toContain(`https://admin.test${path}`);
+    }
+
+    await sw.dispatch("activate");
+    expect(sw.stores.has("nestquest-admin-shell-v0")).toBe(false);
+    expect(sw.self.clients.claim).toHaveBeenCalled();
+  });
+
+  it("serves the cached shell for navigations when offline", async () => {
+    let online = true;
+    const sw = loadServiceWorker(async (url) => {
+      if (!online) throw new TypeError("Failed to fetch");
+      return new FakeResponse(`net:${url}`);
+    });
+    await sw.dispatch("install");
+    online = false;
+
+    const { result } = await sw.dispatch("fetch", {
+      request: request("/children/42", { mode: "navigate", destination: "document" }),
+    });
+    expect((result as FakeResponse).body).toBe("net:https://admin.test/index.html");
+  });
+
+  it("serves static assets cache-first and fills the runtime cache", async () => {
+    const sw = loadServiceWorker(async (url) => new FakeResponse(`net:${url}`));
+    const asset = request("/assets/index-abc123.js", { destination: "script" });
+
+    const first = await sw.dispatch("fetch", { request: asset });
+    expect((first.result as FakeResponse).body).toBe("net:https://admin.test/assets/index-abc123.js");
+    expect(sw.fetchFn).toHaveBeenCalledTimes(1);
+
+    const second = await sw.dispatch("fetch", { request: asset });
+    expect((second.result as FakeResponse).body).toBe("net:https://admin.test/assets/index-abc123.js");
+    expect(sw.fetchFn).toHaveBeenCalledTimes(1);
+  });
+
+  it("never handles cross-origin, non-GET or non-static requests", async () => {
+    const sw = loadServiceWorker(async (url) => new FakeResponse(`net:${url}`));
+    const cases = [
+      request("https://auth.example.com/logo.png", { destination: "image" }),
+      request("/assets/app.js", { destination: "script", method: "POST" }),
+      request("/api/admin/children"),
+    ];
+    for (const req of cases) {
+      const { responded } = await sw.dispatch("fetch", { request: req });
+      expect(responded).toBe(false);
+    }
+    expect(sw.fetchFn).not.toHaveBeenCalled();
+  });
+});
+
+describe("registerServiceWorker", () => {
+  afterEach(() => {
+    vi.unstubAllEnvs();
+    vi.unstubAllGlobals();
+    vi.restoreAllMocks();
+  });
+
+  const stubServiceWorker = (register: ReturnType<typeof vi.fn>) =>
+    vi.stubGlobal("navigator", { ...navigator, serviceWorker: { register } });
+
+  it("does not register outside production builds", async () => {
+    const register = vi.fn();
+    stubServiceWorker(register);
+    expect(import.meta.env.PROD).toBe(false);
+    await registerServiceWorker();
+    expect(register).not.toHaveBeenCalled();
+  });
+
+  it("registers /sw.js in production", async () => {
+    vi.stubEnv("PROD", true);
+    const register = vi.fn().mockResolvedValue({});
+    stubServiceWorker(register);
+    await registerServiceWorker();
+    expect(register).toHaveBeenCalledWith("/sw.js", { scope: "/" });
+  });
+
+  it("logs instead of throwing when registration fails", async () => {
+    vi.stubEnv("PROD", true);
+    stubServiceWorker(vi.fn().mockRejectedValue(new Error("boom")));
+    const error = vi.spyOn(console, "error").mockImplementation(() => {});
+    await expect(registerServiceWorker()).resolves.toBeUndefined();
+    expect(error).toHaveBeenCalled();
+  });
+
+  it("does nothing when the browser lacks service workers", async () => {
+    vi.stubEnv("PROD", true);
+    vi.stubGlobal("navigator", {});
+    await expect(registerServiceWorker()).resolves.toBeUndefined();
+  });
+});

admin/src/pwa/register.ts

@@ -0,0 +1,13 @@
+/**
+ * Service worker registration for the installable admin PWA.
+ * Registers /sw.js only in production builds, so dev servers and tests never
+ * run a worker. Failures are logged, never thrown — the app works without it.
+ */
+export async function registerServiceWorker(): Promise<void> {
+  if (!import.meta.env.PROD || !("serviceWorker" in navigator)) return;
+  try {
+    await navigator.serviceWorker.register("/sw.js", { scope: "/" });
+  } catch (error) {
+    console.error("Service worker registration failed:", error);
+  }
+}