fix(pricing): correct relative hedge payoff calculations

app/pages/hedge.py

@@ -22,12 +22,13 @@ logger = logging.getLogger(__name__)
 def _cost_benefit_options(metrics: dict) -> dict:
     return {
         "tooltip": {"trigger": "axis"},
+        "grid": {"left": 64, "right": 24, "top": 24, "bottom": 48},
         "xAxis": {
             "type": "category",
             "data": [f"${point['price']:.0f}" for point in metrics["scenario_series"]],
-            "name": "GLD spot",
+            "name": "Collateral spot",
         },
-        "yAxis": {"type": "value", "name": "Net benefit / oz"},
+        "yAxis": {"type": "value", "name": "Net hedge benefit / oz"},
         "series": [
             {
                 "type": "bar",
@@ -35,6 +36,11 @@ def _cost_benefit_options(metrics: dict) -> dict:
                 "itemStyle": {
                     "color": "#0ea5e9",
                 },
+                "markLine": {
+                    "symbol": "none",
+                    "lineStyle": {"color": "#94a3b8", "type": "dashed"},
+                    "data": [{"yAxis": 0}],
+                },
             }
         ],
     }
@@ -49,12 +55,14 @@ def _waterfall_options(metrics: dict) -> dict:
 
     return {
         "tooltip": {"trigger": "axis", "axisPointer": {"type": "shadow"}},
+        "grid": {"left": 80, "right": 24, "top": 24, "bottom": 48},
         "xAxis": {"type": "category", "data": [label for label, _ in steps]},
         "yAxis": {"type": "value", "name": "USD"},
         "series": [
             {
                 "type": "bar",
                 "data": values,
+                "label": {"show": True, "position": "top", "formatter": "{c}"},
             },
         ],
     }