fix(trend): remove inferred DCA fill prices across all exchanges

Unify display on trend_leg_display_price: use recorded fills or grid triggers only; last done row avg comes from live entry, never back-solve trigger prices.

Co-authored-by: Cursor <cursoragent@cursor.com>

strategy_trend_register.py

@@ -457,14 +457,14 @@ def _trend_add_leg_fields(cfg: dict, d: dict) -> dict:
         grid = []
     add_prices: list[float] = []
     try:
-        from strategy_trend_lib import reconcile_trend_leg_fill_prices
+        from strategy_trend_lib import trend_leg_display_price
 
-        fills = reconcile_trend_leg_fill_prices(out)
         for i in range(1, legs_done + 1):
-            if i < len(fills):
-                add_prices.append(float(fills[i]))
+            px = trend_leg_display_price(out, i)
+            if px is not None:
+                add_prices.append(float(px))
     except Exception:
-        fills = []
+        pass
     if not add_prices:
         for x in grid[:legs_done]:
             try: