fix: correct hedge equity math at downside scenarios

app/pages/hedge.py

@@ -35,19 +35,20 @@ def _waterfall_options(metrics: dict) -> dict:
     steps = metrics["waterfall_steps"]
     running = 0.0
     base: list[float] = []
-    values: list[float] = []
-    for index, (_, amount) in enumerate(steps):
+    values: list[dict[str, object]] = []
+    for index, (label, amount) in enumerate(steps):
         if index == 0:
             base.append(0)
-            values.append(amount)
             running = amount
         elif index == len(steps) - 1:
             base.append(0)
-            values.append(amount)
         else:
             base.append(running)
-            values.append(amount)
             running += amount
+
+        color = "#0ea5e9" if label == "Net equity" else ("#22c55e" if amount >= 0 else "#ef4444")
+        values.append({"value": amount, "itemStyle": {"color": color}})
+
     return {
         "tooltip": {"trigger": "axis", "axisPointer": {"type": "shadow"}},
         "xAxis": {"type": "category", "data": [label for label, _ in steps]},
@@ -58,14 +59,12 @@ def _waterfall_options(metrics: dict) -> dict:
                 "stack": "total",
                 "data": base,
                 "itemStyle": {"color": "rgba(0,0,0,0)"},
+                "tooltip": {"show": False},
             },
             {
                 "type": "bar",
                 "stack": "total",
                 "data": values,
-                "itemStyle": {
-                    "color": "#22c55e",
-                },
             },
         ],
     }