test[utils]: Add flowkey test

[Satyam0000000]

Add missing test coverage for flowKey secret path

Files Changed

File	Change
src/__tests__/utils.test.ts	Added 3 new test cases

No changes to source files — this is test-only.

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Tests Added (src/__tests__/utils.test.ts)

it("returns the same key for the same flow and secret", () => {
  const a = flowKey("my-flow", { secret: "s3cret" });
  const b = flowKey("my-flow", { secret: "s3cret" });
  expect(a).toBe(b);
});

it("returns different keys for different secrets", () => {
  const a = flowKey("my-flow", { secret: "secret1" });
  const b = flowKey("my-flow", { secret: "secret2" });
  expect(a).not.toBe(b);
});

it("produces different keys for same secret but different flows", () => {
  const a = flowKey("flow-a", { secret: "s3cret" });
  const b = flowKey("flow-b", { secret: "s3cret" });
  expect(a).not.toBe(b);
});