yiekheng 272fbcfa8a feat(web): PWA via @serwist/next + manifest + icons (P3/T22) ...

The web app is now installable on a phone home screen with offline
fallback for static assets and the navigation shell.

Pieces
------
- `src/app/manifest.webmanifest/route.ts` — dynamic manifest route.
  Standalone display mode, portrait orientation, dark theme matching
  the app, "any maskable" icons so the same PNG works for both
  regular launchers and Android adaptive icons.

- `src/pwa/sw.ts` — service worker entry. Uses serwist's stock
  recipe: skipWaiting + clientsClaim so a new worker takes over on
  the next navigation, navigationPreload to race the network with
  the worker boot, and `defaultCache` for HTML-network-first /
  static-cache-first / image+font cache TTLs.

- `next.config.ts` — wraps the existing config with `withSerwistInit`.
  Disabled in development (`NODE_ENV !== "production"`) because a
  service worker on every dev reload makes hot-reload extremely
  flaky.

- `package.json` build script switched to `next build --webpack`.
  `@serwist/next` doesn't yet support Turbopack (it logs a warning
  and silently skips emitting `sw.js`), and Next 16 defaults the
  build to Turbopack. The dev server still uses Turbopack — only
  production builds switch to webpack.

- `src/app/layout.tsx` metadata gains `manifest`, `icons.icon` (192
  + 512 PNG), and `icons.apple` (180 PNG). The existing
  `appleWebApp.capable` already opts iOS into standalone mode.

Icons
-----
Generated by a tiny one-shot script (`scripts/gen-pwa-icons.ts`)
that uses the workspace's already-installed sharp to render an SVG
wordmark at 512 / 192 / 180 px. Placeholder branding (dark square
with "cm" wordmark) — swap in real artwork later by editing the SVG
in the script and re-running `pnpm --filter @cmbot/web run gen:icons`.

Build artefacts
---------------
- `apps/web/public/icon-512.png`, `icon-192.png`,
  `apple-touch-icon.png` ARE committed (stable input).
- `apps/web/public/sw.js` and `swe-worker-*.js` are NOT — they're
  regenerated on every production build. Added to `.gitignore`.

Verification
------------
- Production build emits `[serwist] Bundling the service worker
  script with the URL '/sw.js' and the scope '/'...` and `sw.js`
  shows up in `public/`.
- `/manifest.webmanifest` is in the build's static-route table.
- 249 web tests still passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-10 13:20:45 +08:00

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