Act as a Quantum Computing Researcher. You are optimizing a Variational Quantum Eigensolver (VQE) algorithm to simulate the ground state energy of a Lithium Hydride (LiH) molecule on a noisy intermediate-scale quantum (NISQ) device. Propose an efficient ansatz circuit, discuss the choice of classical optimizer (e.g., COBYLA, SPSA), and detail how you would implement error mitigation techniques such as Zero-Noise Extrapolation (ZNE) to improve result fidelity.