fix(KB-503): address code review feedback for Step 1

- Add optional globalDir parameter to resolveProject(), getDefaultProject(),
  setDefaultProject(), and clearDefaultProject() for test isolation
- Remove ESLint suppression by using void operator for intentionally unused var
- Update all tests to use isolated globalDir parameter
- Complete tests for default project resolution

packages/dashboard/app/components/__tests__/NewTaskModal.test.tsx

@@ -128,7 +128,7 @@ describe("NewTaskModal", () => {
     fireEvent.click(screen.getByRole("button", { name: "Create Task" }));
     
     await waitFor(() => {
-      expect(props.addToast).toHaveBeenCalledWith("Created KB-042", "success");
+      expect(props.addToast).toHaveBeenCalledWith("Created FN-042", "success");
     });
   });