feat(offline): implicit net-state model, two-tier version gate, unified lobby

Land the offline-model redesign (ANDROID_PLAN.md O1-O7): replace the explicit offline toggle with a single detected net-state machine, unify the lobby, and add a two-tier client-version gate. Contour-safe: both version vars empty => dormant, and the wire change is additive, so web/pwa/vk/tg behaviour is unchanged unless the gate is deliberately configured.

O1 pure net-state reducer (test-first). O2 reactive store + event wiring (connection/offline become thin shims; +@capacitor/network). O3 remove the offline toggle + migrate the pref. O4 two-tier gate: hard update_required degrades to an offline Update/Play-offline notice (not terminal); soft GATEWAY_RECOMMENDED_CLIENT_VERSION -> X-Update-Recommended nudge. O5 unified lobby (device-local + greyed-from-cache server games; self-set identity; closes G-step-0). O6 create flows (with-friends online/offline segment + offline dict guard). O7 docs (ARCHITECTURE, FUNCTIONAL +_ru, TESTING, deploy/README).

Also disable the manual android-build CI workflow for now (rename to .disabled); the Android APK release comes later.

Tests: gateway go green, svelte-check 0/0, vitest 617, e2e 122/122 (chromium + webkit).

ui/scripts/bundle-size.mjs

@@ -36,13 +36,9 @@ const DIST = 'dist';
 // highlight geometry (lib/formed.ts), the on-board score badge and the bag / turn-strip / board-zoom
 // wiring live in the always-loaded Game / Board / Rack screens, then to 127 for the wallet storefront
 // redesign — its buy/spend toggle, compact balance and exchange-confirm dialog ride the same
-// always-loaded Wallet screen — then to 130 for the offline-model redesign: the net-state machine
-// (`netstate`), the two-tier version gate (the transport interceptor + the Update/Play-offline notice
-// + the update-available nudge) and the unified-lobby / create-flow wiring ride the always-loaded
-// transport / App / Lobby / New Game screens (the dict-availability guard's `getDawg` stays lazy). The
-// heavy parts — the dict loader, the move generator and the preload orchestration — still stay in lazy
-// chunks. Scoped CSS lands in the CSS chunk, not this JS budget.
-const BUDGET = { app: 130, shared: 31, landing: 5 };
+// always-loaded Wallet screen. The heavy parts — the dict loader, the move generator and the preload
+// orchestration — still stay in lazy chunks. Scoped CSS lands in the CSS chunk, not this JS budget.
+const BUDGET = { app: 127, shared: 31, landing: 5 };
 
 // gzipped returns the gzipped byte size of a built asset, or 0 when the reference is not a
 // local file (e.g. the Telegram SDK loaded from a CDN) or is missing.