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/e2e/hotseat.spec.ts

@@ -1,8 +1,9 @@
 import { test, expect, type Page } from './fixtures';
 
-// Offline pass-and-play (hotseat) is offered only in offline mode, which is gated to an installed
-// standalone PWA with a confirmed email. The mock account has an email; force standalone so the
-// Settings offline toggle shows.
+// Offline pass-and-play (hotseat) is offered only in offline mode, which is now implicit (the net-state
+// machine detects it — no toggle). The e2e drives the machine through the mock's __net hook. Standalone
+// display mode is still forced so the mock's offline dictionary path (served from /e2edict/) matches an
+// installed PWA.
 async function forceStandalone(page: Page): Promise<void> {
   await page.addInitScript(() => {
     const orig = window.matchMedia.bind(window);
@@ -19,11 +20,9 @@ async function enterLobby(page: Page): Promise<void> {
 }
 
 async function goOffline(page: Page): Promise<void> {
-  await page.locator('button.tab').nth(2).click(); // Settings
-  await page.getByRole('button', { name: /^(Offline|Оффлайн)$/ }).click();
+  // The machine auto-detects offline (no toggle, no dialog); the lobby stays mounted and turns blue.
+  await page.evaluate(() => (window as unknown as { __net: { offline(): void } }).__net.offline());
   await expect(page.locator('header.nav.offline')).toBeVisible({ timeout: 15000 });
-  await page.getByRole('button', { name: /Back|Назад/i }).click();
-  await expect(page.locator('button.tab').nth(2)).toBeVisible();
 }
 
 // typePin clicks the on-screen keypad digits (the pad has no OK button — the 4th digit is the action).
@@ -46,9 +45,12 @@ test.describe('offline hotseat (pass-and-play)', () => {
     // randomised at start; the shuffle is seed-driven — seed '1' would seat Bob first, '2' Ann first.)
     await page.evaluate(() => (window as unknown as { __mock: { setLocalSeed(s: string): void } }).__mock.setLocalSeed('2'));
 
-    // New game -> the offline mode selector now offers "with friends" (hotseat).
+    // New game -> "with friends" offers an online (invite) / offline (hotseat) segment. Offline, the
+    // online segment is disabled and the offline (pass-and-play) one is forced, so the hotseat form shows.
     await page.locator('button.tab').nth(0).click();
     await page.getByRole('button', { name: /With friends|друзьями/i }).click();
+    await expect(page.getByRole('button', { name: /Invite a friend|Пригласить друга/i })).toBeDisabled();
+    await expect(page.locator('.hostpin')).toBeVisible();
 
     // The player rows are disabled until the mandatory host (master) PIN is set.
     await expect(page.locator('.pname').first()).toBeDisabled();
@@ -115,12 +117,12 @@ test.describe('offline hotseat (pass-and-play)', () => {
     // Back in the lobby the active hotseat game has a kebab; terminating it needs the master PIN.
     await page.getByRole('button', { name: /Back|Назад/i }).click();
     await expect(page.getByText('Ann', { exact: false }).first()).toBeVisible();
-    await expect(page.locator('.rowwrap')).toHaveCount(1);
+    await expect(page.locator('.rowwrap:not(.greyed)')).toHaveCount(1);
     await page.locator('.kebab').first().click();
     const del = page.locator('.rowwrap.revealed .del');
     await expect(del).toBeVisible();
     await del.click();
     await typePin(page, '9999');
-    await expect(page.locator('.rowwrap')).toHaveCount(0);
+    await expect(page.locator('.rowwrap:not(.greyed)')).toHaveCount(0);
   });
 });