feat: add Russian localization and independent STT languages

src/core/settings.ts

@@ -233,6 +233,10 @@ export const ROLE_SLOT: Readonly<Record<ModelRole, ModelSlotName>> = {
 export interface GeneralSettings {
 	/** Auto-update the app (default ON). Mechanism ships in a later wave. */
 	autoUpdate?: boolean;
+	/** Absent = browser/system language (English for unsupported languages). */
+	language?: "en" | "ru";
+	/** Independent dictation language; absent = browser/system language. */
+	sttLanguage?: "en" | "ru";
 }
 
 /** Agent settings — everything about the non-conversation machinery. */
@@ -377,7 +381,7 @@ export interface UserSettings {
  *  prompts default off — hence their absence here. */
 export interface FactorySettings {
 	version: number;
-	general: Required<GeneralSettings>;
+	general: GeneralSettings & { autoUpdate: boolean };
 	appearance: {
 		mode: "dark" | "light";
 		background: string | null;
@@ -441,6 +445,9 @@ function sanitizeGeneral(raw: Record<string, unknown>): GeneralSettings {
 	const out: GeneralSettings = {};
 	const autoUpdate = boolOrDrop(raw.autoUpdate);
 	if (autoUpdate !== undefined) out.autoUpdate = autoUpdate;
+	for (const key of ["language", "sttLanguage"] as const) {
+		if (raw[key] === "en" || raw[key] === "ru") out[key] = raw[key];
+	}
 	return out;
 }