chore: remove unused imports and dead code

verify_sync.py

@@ -22,7 +22,7 @@ Usage:
 """
 
 from __future__ import annotations
-import os, sys, math, argparse, subprocess, json, shutil, time, threading, tempfile, warnings
+import os, sys, math, argparse, subprocess, json, shutil, threading, tempfile, warnings
 import numpy as np
 
 warnings.filterwarnings("ignore", category=RuntimeWarning, module="pyqtgraph")
@@ -54,12 +54,6 @@ try:
 except ImportError:
     HAS_SD = False
 
-try:
-    import soundfile as sf
-    HAS_SF = True
-except ImportError:
-    HAS_SF = False
-
 from sync_audio import load_wav
 from waveform_cache import cached_load_wav