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feat: add PWA support (manifest, service worker, install prompt) (#920)

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* feat: add PWA support (manifest, service worker, install prompt) (v0.50.178, #911)

Co-authored-by: bsgdigital
Closes #685

* fix(sw): await caches.match() before `|| fallback` so offline HTML actually shows

The offline-navigation fallback was dead code:

    return caches.match('./') || new Response('<html>...</html>', ...);

`caches.match()` returns a Promise, and Promise objects are always truthy
in a `||` check — so the `new Response(...)` branch was never taken. On
actual offline, `caches.match('./')` resolves to undefined (no cache hit
for the root), the SW returns undefined, and the browser falls back to
its own default offline page. The custom "Hermes requires a server
connection" HTML was unreachable.

Fix by threading the match through `.then()` so the resolved value (not
the Promise object) feeds the `||`:

    return caches.match('./').then((cached) => cached || new Response(...));

Added 13 regression tests in tests/test_pwa_manifest_sw.py covering:
- manifest.json validity + required PWA fields + icon existence
- sw.js cache-version placeholder + API/stream bypass + correct offline
  pattern (explicitly rejects the broken `|| new Response` shape so it
  can't regress)
- /manifest.json + /sw.js routes serve correct Content-Type,
  Cache-Control, Service-Worker-Allowed headers and inject WEBUI_VERSION
- index.html links manifest, registers SW, has iOS PWA meta tags

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

---------

Co-authored-by: nesquena-hermes <nesquena-hermes@users.noreply.github.com>
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
nesquena-hermes
2026-04-23 15:14:21 -07:00
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parent 07caaec6ef
commit 1011918d50
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@@ -33,6 +33,10 @@
### Fixed
- **Settings dialog and message controls unusable on mobile** — three mobile usability fixes: (1) settings tab strip replaced by a native `<select>` dropdown on narrow viewports, panel goes full-width; (2) provider card Save/Remove buttons become icon-only on mobile so the API key input fills the available width; (3) message timestamps, copy, and edit buttons are always visible on touch screens (no hover state on mobile). (`static/index.html`, `static/panels.js`, `static/style.css`) Co-authored by @bsgdigital.
## [v0.50.178] — 2026-04-23
### Added
- **PWA support — installable as a standalone app** — adds a Web App Manifest (`manifest.json`) and a minimal service worker (`sw.js`) with cache-first strategy for app shell assets and network-bypass for all `/api/*` and `/stream` endpoints. Cache name auto-busts on every deploy via git-derived version injection. Enables "Add to Home Screen" on Android, iOS, and desktop Chrome without any offline API response caching (live backend always required). (`static/manifest.json`, `static/sw.js`, `static/index.html`, `api/routes.py`) Closes #685. Co-authored by @bsgdigital.
## [v0.50.176] — 2026-04-23