feat: add multilingual dictation and simplify chat STT picker

tests/settings-store.test.ts

@@ -48,6 +48,12 @@ describe("the settings store", () => {
 		assert.ok(out);
 		assert.deepEqual(out.graph, { enabled: false });
 	});
+	it("persists multilingual STT independently of the interface language and update preference", () => {
+		const general = { language: "ru", sttLanguage: "multi", autoUpdate: false } as const;
+		writeSettings({ version: 1, general });
+		assert.deepEqual(JSON.parse(fs.readFileSync(SETTINGS_FILE, "utf-8")).general, general);
+		assert.deepEqual(readSettings()?.general, general);
+	});
 
 	it("a chat section on disk is IGNORED — the field died with per-session models (owner, 2026-09-28)", () => {
 		fs.mkdirSync(path.dirname(SETTINGS_FILE), { recursive: true });