fix(dashboard): another Home crash — top_conviction_week vs _7d

Round-2 of the Home/Strategy contract drift. The dashboard endpoint
returns top_conviction_7d, but the frontend type+code referenced
top_conviction_week — so the section render crashed on
undefined.length.

Renamed type field + code references to top_conviction_7d to match
the actual API, and kept the ?? [] guard so future drift can't crash.

dashboard/src/pages/meetKevin/Home.tsx

@@ -141,13 +141,13 @@ export default function MeetKevinHome() {
           </Link>
 
           {/* Top conviction this week */}
-          {dashboard && dashboard.top_conviction_week.length > 0 && (
+          {dashboard && (dashboard.top_conviction_7d ?? []).length > 0 && (
             <div className="bg-slate-800 border border-slate-700 rounded-xl p-5 space-y-3">
               <h3 className="text-sm font-semibold text-slate-300 uppercase tracking-wide">
                 Top Conviction — Last 7 Days
               </h3>
               <div className="space-y-2">
-                {dashboard.top_conviction_week.map(
+                {(dashboard.top_conviction_7d ?? []).map(
                   (row: {
                     symbol: string;
                     max_conviction: number;

dashboard/src/types/meetKevin.ts

@@ -107,11 +107,13 @@ export interface PipelineHealth {
 export interface DashboardData {
   latest_video: VideoSummary | null;
   latest_analysis: VideoAnalysis | null;
-  top_conviction_week: {
-    symbol: string;
-    max_conviction: number;
-    mention_count: number;
-  }[];
+  top_conviction_7d:
+    | {
+        symbol: string;
+        max_conviction: number;
+        mention_count: number;
+      }[]
+    | null;
   outlook_trend_14d: {
     day: string;
     direction: MarketOutlook;