feat: v1.34.0 — Mobile UI Early Preview, Russian 2, macOS network fix

Co-authored-by: kilyabin <kilyabin@users.noreply.github.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/hooks/useIsMobile.ts

@@ -0,0 +1,33 @@
+import { useSyncExternalStore } from 'react';
+
+const MOBILE_BREAKPOINT = 800;
+const query = `(max-width: ${MOBILE_BREAKPOINT - 1}px)`;
+
+let mql: MediaQueryList | null = null;
+
+function getMql(): MediaQueryList {
+  if (!mql) mql = window.matchMedia(query);
+  return mql;
+}
+
+function subscribe(cb: () => void): () => void {
+  const m = getMql();
+  m.addEventListener('change', cb);
+  return () => m.removeEventListener('change', cb);
+}
+
+function getSnapshot(): boolean {
+  return getMql().matches;
+}
+
+function getServerSnapshot(): boolean {
+  return false;
+}
+
+/**
+ * Returns `true` when the viewport width is below 800px.
+ * Updates in real-time on resize via `matchMedia`.
+ */
+export function useIsMobile(): boolean {
+  return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot);
+}