fix: Remove agreed_price from price API response

The agreed_price depends on trade direction (buy/sell) and must be
calculated on the frontend. Returning a buy-side-only agreed_price
from the API was misleading and unused.

Frontend already calculates the direction-aware price correctly.

frontend/playwright.config.ts

@@ -6,6 +6,8 @@ export default defineConfig({
   workers: 1,
   // Ensure tests within a file run in order
   fullyParallel: false,
+  // Test timeout (per test)
+  timeout: 10000,
   webServer: {
     command: "npm run dev",
     url: "http://localhost:3000",
@@ -13,5 +15,7 @@ export default defineConfig({
   },
   use: {
     baseURL: "http://localhost:3000",
+    // Action timeout (clicks, fills, etc.)
+    actionTimeout: 5000,
   },
 });