feat: add stock database with prisma for portfolio persistence

- Initialize Prisma with SQLite and Stock model
- Create database service layer with singleton client
- Add API routes for stock CRUD operations
- Integrate database with analyze page to persist ticker entries
- Add Playwright tests for stock database functionality

app/components/StockViewer.tsx

@@ -58,14 +58,14 @@ export default function StockViewer() {
       
       {indicators && (
         <div className="bg-gray-50 rounded-lg p-4">
-          <h3 className="font-bold text-gray-900 mb-3">
+          <h3 className="text-xl font-bold text-gray-900 mb-3">
             Results for {symbol.toUpperCase()}
           </h3>
           <div className="space-y-2">
             {Object.entries(indicators).map(([key, value]) => (
               <div key={key} className="flex justify-between py-1.5 border-b border-gray-200 last:border-0">
                 <span className="text-gray-600 capitalize">{key}</span>
-                <span className="font-mono font-medium">{value.toFixed(2)}</span>
+                <span className="font-mono font-medium text-gray-900">{value.toFixed(2)}</span>
               </div>
             ))}
           </div>