feat: add waveform cache to avoid re-reading WAV files

verify_sync.py

@@ -61,6 +61,7 @@ except ImportError:
     HAS_SF = False
 
 from sync_audio import load_wav
+from waveform_cache import cached_load_wav
 
 
 # ─── Helpers ───
@@ -209,9 +210,9 @@ class VerifyWindow(QtWidgets.QMainWindow):
 
         # Load audio
         print(f"Loading audio A: {wav_a_path}")
-        self.a_orig, _ = load_wav(wav_a_path, target_sr=sr)
+        self.a_orig, _ = cached_load_wav(wav_a_path, target_sr=sr)
         print(f"Loading audio B: {wav_b_path}")
-        self.b_orig, _ = load_wav(wav_b_path, target_sr=sr)
+        self.b_orig, _ = cached_load_wav(wav_b_path, target_sr=sr)
 
         # Apply lag alignment
         self.a_aligned, self.b_aligned = apply_lag(self.a_orig, self.b_orig, self.lag_samples)