test: add unit tests for getBearerToken (#6843)

Adds a small, focused, additive unit-test file (test/get-bearer-token.test.ts).
No existing files are modified or removed. yarn test:ci passes locally.

Co-authored-by: ytj-zuel <15623621570>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Jeniter

test/get-bearer-token.test.ts

@@ -0,0 +1,20 @@
+import { getBearerToken } from "../app/client/api";
+
+describe("getBearerToken", () => {
+  test("wraps the key with a 'Bearer ' prefix by default", () => {
+    expect(getBearerToken("abc")).toBe("Bearer abc");
+  });
+
+  test("omits the prefix when noBearer is true", () => {
+    expect(getBearerToken("abc", true)).toBe("abc");
+  });
+
+  test("trims surrounding whitespace from the key", () => {
+    expect(getBearerToken("  abc  ")).toBe("Bearer abc");
+  });
+
+  test("returns an empty string when the key is empty", () => {
+    expect(getBearerToken("")).toBe("");
+    expect(getBearerToken("", true)).toBe("");
+  });
+});