fix(dashboard): Strategy page crashed on undefined fields

User reported UI error. Root cause: API GET /api/meet-kevin/strategy/
performance returns {trade_count, closed_trade_count, total_pnl_usd,
win_rate_pct, wins, losses} but the dashboard's StrategyPerformance
type expected {total_return_pct, sharpe_ratio, max_drawdown_pct,
open_positions, alpha_vs_spy_pct, ...}. So performance.open_positions
was undefined and .toString() crashed the whole page render.

Fix: update StrategyPerformance to match the actual API shape and
rewrite the 6-card headline grid to show the metrics the API
actually computes (trade count, closed count, total P&L, win rate,
wins, losses). Defensive ?? 0 fallbacks everywhere so future
schema drift doesn't crash again.

Long-term: extend the API to compute sharpe/max-dd/alpha vs SPY etc.
once there are real Kevin trades to compute them on (currently 0
trades — all 13 emitted signals fired outside market hours and were
correctly rejected by RiskManager).

dashboard/src/pages/meetKevin/Strategy.tsx

@@ -123,36 +123,35 @@ export default function MeetKevinStrategy() {
 
       {/* Headline metrics */}
       {performance && (
-        <div className="grid grid-cols-2 md:grid-cols-4 xl:grid-cols-6 gap-4">
+        <div className="grid grid-cols-2 md:grid-cols-3 xl:grid-cols-6 gap-4">
           <MetricCard
-            label="Total Return"
-            value={fmt(performance.total_return_pct)}
-            color={performance.total_return_pct >= 0 ? 'text-green-400' : 'text-red-400'}
+            label="Total Trades"
+            value={(performance.trade_count ?? 0).toString()}
           />
           <MetricCard
-            label="Ann. Return"
-            value={fmt(performance.annualized_return_pct)}
-            color={(performance.annualized_return_pct ?? 0) >= 0 ? 'text-green-400' : 'text-red-400'}
+            label="Closed Trades"
+            value={(performance.closed_trade_count ?? 0).toString()}
           />
           <MetricCard
-            label="Sharpe"
-            value={performance.sharpe_ratio != null ? performance.sharpe_ratio.toFixed(2) : '—'}
-            color={(performance.sharpe_ratio ?? 0) >= 1 ? 'text-green-400' : 'text-yellow-400'}
+            label="Total P&L"
+            value={`${(performance.total_pnl_usd ?? 0) >= 0 ? '+' : ''}$${(performance.total_pnl_usd ?? 0).toFixed(2)}`}
+            color={(performance.total_pnl_usd ?? 0) >= 0 ? 'text-green-400' : 'text-red-400'}
           />
           <MetricCard
-            label="Max Drawdown"
-            value={performance.max_drawdown_pct != null ? `${performance.max_drawdown_pct.toFixed(2)}%` : '—'}
+            label="Win Rate"
+            value={`${(performance.win_rate_pct ?? 0).toFixed(1)}%`}
+            color={(performance.win_rate_pct ?? 0) >= 50 ? 'text-green-400' : 'text-yellow-400'}
+          />
+          <MetricCard
+            label="Wins"
+            value={(performance.wins ?? 0).toString()}
+            color="text-green-400"
+          />
+          <MetricCard
+            label="Losses"
+            value={(performance.losses ?? 0).toString()}
             color="text-red-400"
           />
-          <MetricCard
-            label="Alpha vs SPY"
-            value={fmt(performance.alpha_vs_spy_pct)}
-            color={(performance.alpha_vs_spy_pct ?? 0) >= 0 ? 'text-green-400' : 'text-red-400'}
-          />
-          <MetricCard
-            label="Open Positions"
-            value={performance.open_positions.toString()}
-          />
         </div>
       )}
 

dashboard/src/types/meetKevin.ts

@@ -199,13 +199,12 @@ export interface StrategyEquityCurve {
 }
 
 export interface StrategyPerformance {
-  total_return_pct: number;
-  annualized_return_pct: number | null;
-  sharpe_ratio: number | null;
-  max_drawdown_pct: number | null;
-  win_rate: number | null;
+  // Live-path metrics — current shape from
+  // GET /api/meet-kevin/strategy/performance.
   trade_count: number;
-  alpha_vs_spy_pct: number | null;
-  open_positions: number;
-  last_backtest_at: string | null;
+  closed_trade_count: number;
+  total_pnl_usd: number;
+  win_rate_pct: number;
+  wins: number;
+  losses: number;
 }