feat: add Russian localization and independent STT languages

components/update-banner.tsx

@@ -1,4 +1,6 @@
 "use client";
+import { useI18n } from "@/components/i18n";
+
 
 /**
  * The auto-update banner (Wave C, owner 2026-10-10: silent download +
@@ -19,6 +21,7 @@ import { useEffect, useState } from "react";
 type UpdateStatus = { status: string; version: string | null };
 
 export default function UpdateBanner() {
+	const { t } = useI18n();
 	const [ready, setReady] = useState<UpdateStatus | null>(null);
 
 	useEffect(() => {
@@ -35,16 +38,15 @@ export default function UpdateBanner() {
 			className="fixed right-4 bottom-4 z-50 flex items-center gap-3 rounded-lg border border-border bg-popover px-4 py-3 shadow-lg"
 		>
 			<div className="text-sm">
-				<span className="font-medium">LearnHarness {ready.version ?? "update"} is ready</span>
-				<span className="text-muted-foreground"> — restart to finish installing.</span>
+				<span className="font-medium">LearnHarness {ready.version ?? "update"}{" "}{t("is ready")}</span>
+				<span className="text-muted-foreground"> {" "}{t("— restart to finish installing.")}</span>
 			</div>
 			<button
 				type="button"
 				onClick={() => window.lh?.installUpdate?.()}
 				className="rounded-md bg-accent px-3 py-1.5 text-sm font-medium transition-colors hover:bg-accent/80"
 			>
-				Restart
-			</button>
+				{t("Restart")}</button>
 		</div>
 	);
 }