Fix crash on third-party details when country is GLOBAL

Intl.DisplayNames rejects the GLOBAL pseudo-region, so label
resolution now handles it explicitly before rendering the picker.

Signed-off-by: Sacha Al Himdani <sacha@probo.com>

packages/helpers/src/countries.test.ts

@@ -0,0 +1,43 @@
+// Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+import { describe, it, expect } from "vitest";
+import { getCountryName, getCountryOptions } from "./countries";
+
+describe("getCountryName", () => {
+    it("returns a label for the GLOBAL pseudo-region", () => {
+        expect(getCountryName("en", "GLOBAL")).toBe("Global");
+    });
+
+    it("returns localized names for ISO country codes", () => {
+        expect(getCountryName("en", "US")).toBe("United States");
+        expect(getCountryName("en", "EU")).toBe("European Union");
+    });
+});
+
+describe("getCountryOptions", () => {
+    it("includes GLOBAL without throwing", () => {
+        const options = getCountryOptions("en");
+        expect(options.find(option => option.value === "GLOBAL")).toEqual({
+            value: "GLOBAL",
+            label: "Global",
+        });
+    });
+});

packages/helpers/src/countries.ts

@@ -50,8 +50,22 @@ export const countries = [
 
 export type CountryCode = typeof countries[number];
 
+// Pseudo-regions accepted by our CountryCode enum but not by Intl.DisplayNames.
+const pseudoRegionNames: Partial<Record<CountryCode, string>> = {
+    GLOBAL: "Global",
+};
+
 export function getCountryName(language: string, code: CountryCode): string {
-    return new Intl.DisplayNames(language, { type: "region" }).of(code) ?? code;
+    const pseudoName = pseudoRegionNames[code];
+    if (pseudoName) {
+        return pseudoName;
+    }
+
+    try {
+        return new Intl.DisplayNames(language, { type: "region" }).of(code) ?? code;
+    } catch {
+        return code;
+    }
 }
 
 export function getCountryOptions(lang: string) {