test: allow smoke runs with an existing Chromium binary

playwright.smoke.config.ts

@@ -2,6 +2,7 @@ import { defineConfig } from '@playwright/test'
 
 const baseURL = process.env.BASE_URL || 'http://127.0.0.1:41741'
 const port = new URL(baseURL).port || '41741'
+const executablePath = process.env.PLAYWRIGHT_EXECUTABLE_PATH
 const reuseExistingServer = process.env.PLAYWRIGHT_REUSE_SERVER
   ? process.env.PLAYWRIGHT_REUSE_SERVER === '1'
   : process.env.CI !== 'true'
@@ -28,7 +29,15 @@ export default defineConfig({
     headless: true,
     storageState: claudeCodeOnboardingStorageState,
   },
-  projects: [{ name: 'chromium', use: { browserName: 'chromium' } }],
+  projects: [
+    {
+      name: 'chromium',
+      use: {
+        browserName: 'chromium',
+        ...(executablePath ? { launchOptions: { executablePath } } : {}),
+      },
+    },
+  ],
   webServer: {
     command: `node scripts/playwright-smoke-server.mjs ${port}`,
     url: baseURL,