feat(settings): add locale-aware font preferences

Bundle optional Inter and Outfit families, preserve the platform system default, and provide script-aware fallbacks for every supported locale.

Refs #31

src/main.tsx

@@ -1,5 +1,7 @@
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
+import "@fontsource-variable/inter/wght.css";
+import "@fontsource-variable/outfit/wght.css";
 import "./index.css";
 import App from "./App";
 import { i18nReady } from "./i18n";