Ilia Denisov
d67e582c03
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The edge caddy 503 carries X-Scrabble-Maintenance during a deploy window, but a user already in the running SPA only sees their calls start failing — the static caddy page catches only a fresh load. Detect that marker (strictly — not any transient 'unavailable', which the Connecting indicator already covers) on the raw ConnectError at the two transport catch sites (unary exec + the live subscribe stream), before toGatewayError discards the response headers, and raise a non-dismissable dimmed overlay that mirrors the static caddy page. It self-clears: a capped-backoff poll (a cheap read, mirroring connection.svelte.ts) lifts it on the first success, and a manual "retry" button forces an immediate re-check — so it can never get stuck. On detection the read retry loop fails fast, so a window doesn't burn the retry budget on every call. - pure detector maintenance.ts (maintenanceRetryMs / parseRetryAfterMs) + unit tests; the store + self-clearing poll in maintenance.svelte.ts (mirrors connection.svelte.ts) - MaintenanceOverlay.svelte (clones Splash's fixed/inset/dimmed shell, non-dismissable), mounted app-global in App.svelte after Coachmark - transport.ts detects + reports at both catch sites, clears on any successful read - i18n RU "Технические работы" / EN "Under maintenance"; a window.__maint mock hook (the mock can't emit a real 503) + a Playwright spec Prod is same-origin (VITE_GATEWAY_URL empty) so the marker header is readable without a CORS expose-header. Verified: pnpm check (0), unit (402), build, e2e (186, Chromium+WebKit).