[Tingliangstu]

What changed

• Use a shared four-decimal formatter for path endpoints, reduced q-point lists, and calculation progress.
• Display rounded -0.0000 as 0.0000; preserve other negative values and all numerical arrays.

What this improves

• Remove misleading negative-zero coordinates from terminal output consistently.

Validation

• Direct display checks passed for signed zero, small negative values around the rounding boundary, negative coordinates, q-path output, progress output, and unchanged input bytes.
• Focused pytest run: 28 passed, 1 failed. The native-thread-limit test (test_persistent_workers_keep_native_thread_limits) also fails on the unchanged base commit in this local environment.
• git diff --check passed.