Update utils.py

utils.py

@@ -96,9 +96,9 @@ def _load_palette(path="plotly_colorwheel.txt"):
         return FALLBACK
 
 _PALETTE = _load_palette()
-# Reserved: 0 = Single Voice (red shade 0), 9 = Multi Voice (green shade 0),
-#           24 = No Voice (grey). Speakers use all other indices.
-_RESERVED = {0, 9, len(_PALETTE) - 1}
+# Reserved indices — must match plotly_colorwheel.txt:
+#   0  = Single Voice, 9 = Multi Voice, 24 = No Voice, 31 = Unassigned
+_RESERVED = {0, 9, 24, 31}
 _SPEAKER_PALETTE = [c for i, c in enumerate(_PALETTE) if i not in _RESERVED]
 
 
@@ -366,7 +366,8 @@ def _voice_color_map(df5_labels, speaker_color_map):
     color_map = {
         "Single Voice": _PALETTE[0],
         "Multi Voice":  _PALETTE[9],
-        "No Voice":     _PALETTE[-1],
+        "No Voice":     _PALETTE[24],
+        "Unassigned":   _PALETTE[31] if len(_PALETTE) > 31 else "#777a7d",
     }
     speaker_labels = [l for l in df5_labels if l not in top_labels]
     for i, lbl in enumerate(speaker_labels):