fix(wavelength_prefix): viz_thread.py 同步 _viz_infer_wavelength_start_column 修改

src/gui/core/viz_thread.py 的 _viz_infer_wavelength_start_column 是

step12_viz_panel.py 副本（无跨文件引用），两处独立维护必须同步。

同步前缀兼容与 DEBUG 日志逻辑。

Why: 同一函数双份副本不一致会导致 worker 子线程路径与 panel 主线程

路径在相同列名格式下表现差异。同步保证行为一致。

src/gui/core/viz_thread.py

@@ -20,17 +20,28 @@ def _viz_training_spectra_csv_path(work_path: Path) -> Path:
 
 def _viz_infer_wavelength_start_column(df) -> Union[str, int]:
     """推断光谱起始列（training_spectra 通常以波长数值为列名，未必含 UTM_Y）。"""
+    import re
     import pandas as pd
+    _PREFIX_RE = re.compile(r"^(?:nm|wavelength|wl|\u03bb|wave_len)[_\s\-]*", re.IGNORECASE)
     for i, col in enumerate(df.columns):
         name = str(col).strip().lstrip("\ufeff")
         try:
             v = float(name)
         except ValueError:
-            continue
-        if 200.0 <= v <= 3000.0:
+            v = None
+        if v is not None and 200.0 <= v <= 3000.0:
             return i
+        stripped = _PREFIX_RE.sub("", name)
+        if stripped != name:
+            try:
+                v = float(stripped)
+            except ValueError:
+                continue
+            if 200.0 <= v <= 3000.0:
+                return i
     if "UTM_Y" in df.columns:
         return "UTM_Y"
+    print(f"DEBUG: 尝试解析的列名: {df.columns.tolist()}")
     return 0