v5.1.0 (#2970)

* chore(release): v5.1.0

* feat: implement resume thumbnails

* fix: remove unused mcp tools

* docs: fix formatting of docs

packages/utils/src/locale.ts

@@ -0,0 +1,8 @@
+// Minimal locale type — the full lingui wiring lives in apps/web (Phase 13).
+export type Locale = string;
+
+export const defaultLocale: Locale = "en-US";
+
+export function isLocale(value: unknown): value is Locale {
+	return typeof value === "string" && value.length > 0;
+}