feat: add Russian localization and independent STT languages

components/usage-format.ts

@@ -1,10 +1,12 @@
+import { localeTag, type Language } from "@/src/core";
 /**
  * Money/token presentation helpers (wave-4 observability UI) — shared by the
  * activity dock and the stats bar. Pure; exported for tests.
  */
 
 /** USD for cent-scale money: >= $1 keeps two decimals, smaller keeps four. */
-export function formatUsd(c: number): string {
+export function formatUsd(c: number, language: Language = "en"): string {
+	if (language === "ru") return `${new Intl.NumberFormat(localeTag(language), { minimumFractionDigits: c >= 1 ? 2 : 4, maximumFractionDigits: c >= 1 ? 2 : 4 }).format(c)} $`;
 	return c >= 1 ? `$${c.toFixed(2)}` : `$${c.toFixed(4)}`;
 }
 
@@ -14,7 +16,8 @@ export function planCostLabel(dollars: number | null, subscription: boolean | st
 }
 
 /** 38000 → "38k", 1234567 → "1.2M" — trimmed, never "38.0k". */
-export function formatTokens(n: number): string {
+export function formatTokens(n: number, language: Language = "en"): string {
+	if (language === "ru") return new Intl.NumberFormat("ru-RU", { notation: "compact", maximumFractionDigits: 1 }).format(n);
 	if (n >= 1e6) return `${+(n / 1e6).toFixed(1)}M`;
 	if (n >= 1e3) return `${+(n / 1e3).toFixed(1)}k`;
 	return String(n);