Make the web SPA an installable PWA and surface it to users:
- manifest.webmanifest + an install-only service worker + 192/512/maskable
icons (ui/public); PWA head tags in index.html; the .webmanifest MIME type
registered in the gateway (the distroless image has no /etc/mime.types).
- Platform-adaptive install CTA (components/InstallApp.svelte + lib/pwa):
one-tap on Chromium, manual Add-to-Home-Screen instructions on iOS Safari,
hidden elsewhere / once installed / inside a Mini App. Shown under the
logged-out login card and at the bottom of Settings.
- The landing gains a third entry linking /app/ (the brand tile), with a
caption under all three (Telegram / VK / Веб-версия).
The service worker is navigation-only (network-first, cached-shell fallback);
hashed assets and the Connect stream are untouched. It exists to satisfy
Chromium's installability requirement and is the single growth point for a
future opt-in offline mode.
Tests: pwa.ts unit tests; a webui probe (manifest/sw.js content-type + the
SPA-fallback-to-HTML trap); e2e for the one-tap CTA, the iOS instructions
modal and the landing web entry. Docs: ARCHITECTURE §13, FUNCTIONAL (+ru),
gateway README.
Ilia Denisov