Update app.py

app.py

@@ -381,7 +381,9 @@ def _x_range_for_tracks(df, cols):
     x_series = pd.concat([pd.to_numeric(df[c], errors="coerce") for c in cols if c in df], ignore_index=True)
     x_lo, x_hi = float(x_series.min()), float(x_series.max())
     pad = 0.03 * (x_hi - x_lo if x_hi > x_lo else 1.0)
-    xmin, xmax == x_lo - x_pad, x_hi + x_pad = x_lo - pad, x_hi + pad  # keep variable names consistent
+    # Option A: keep name pad
+    pad = 0.03 * (x_hi - x_lo if x_hi > x_lo else 1.0)
+    xmin, xmax = x_lo - pad, x_hi + pad
     tick0 = _nice_tick0(xmin, step=max((xmax - xmin)/10.0, 0.1))
     return xmin, xmax, tick0