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/pnpm-lock.yaml

@@ -20,6 +20,9 @@ importers:
       '@capacitor/core':
         specifier: ^8.4.1
         version: 8.4.1
+      '@capacitor/network':
+        specifier: 8.0.1
+        version: 8.0.1(@capacitor/core@8.4.1)
       '@connectrpc/connect':
         specifier: ^2.1.0
         version: 2.1.1(@bufbuild/protobuf@2.12.0)
@@ -638,6 +641,11 @@ packages:
   '@capacitor/core@8.4.1':
     resolution: {integrity: sha512-xqhOGLbTAYeOWK+IDUNSjQJAPapQjRHrIcgk9PYp52or9zFTaaMko31uNi16N6W+CRJ8VrRram6fOYILkBG2Hg==}
 
+  '@capacitor/network@8.0.1':
+    resolution: {integrity: sha512-9xK/FHFmzKGanB6BdoSZOzXk8vF0OFVQSQ4PAsIrzAzLuXHryO317qy8dcHVpgxYeuZq2noI0My9z1DvVDi/9w==}
+    peerDependencies:
+      '@capacitor/core': '>=8.0.0'
+
   '@connectrpc/connect-web@2.1.1':
     resolution: {integrity: sha512-J8317Q2MaFRCT1jzVR1o06bZhDIBmU0UAzWx6xOIXzOq8+k71/+k7MUF7AwcBUX+34WIvbm5syRgC5HXQA8fOg==}
     peerDependencies:
@@ -4333,6 +4341,10 @@ snapshots:
     dependencies:
       tslib: 2.8.1
 
+  '@capacitor/network@8.0.1(@capacitor/core@8.4.1)':
+    dependencies:
+      '@capacitor/core': 8.4.1
+
   '@connectrpc/connect-web@2.1.1(@bufbuild/protobuf@2.12.0)(@connectrpc/connect@2.1.1(@bufbuild/protobuf@2.12.0))':
     dependencies:
       '@bufbuild/protobuf': 2.12.0