Install state (live)
Running as installed app browser tab
Service worker unsupported
On iOS: Share → Add to Home Screen.
PWA
Installable app shell with an honest offline story — manifest, service worker, caching contract, update flow.
Caching contract
"Offline-capable" is scoped honestly: an installable shell with instant repeat loads and a branded /offline fallback — not offline CRUD.
Hashed build assets precached + cache-first — immortal by URL, survives deploys
HTML + __data.json network-only, all routes — offline falls back to
/offline/api/*, SSE, non-GET never intercepted at all (streams must not pass through respondWith)
Query-stringed URLs refused, never normalized — cache-key hygiene (SvelteSpill-class guard)
Sign-out Clear-Site-Data header + explicit worker cache flush
Updates & recovery
No automatic skipWaiting() — updates roll out in two tiers:
Tier 1 — silent a pending update converts the next navigation into a full-page load
Tier 2 — prompt navigation-less sessions get one persistent "Reload" toast after 30 min
Multi-tab controllerchange reloads every open tab together
Kill switch a flag in the worker evacuates all installed clients on the next deploy
Think this pattern could be better? Tell us how.
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