Stabilize frontend Playwright CI runner

playwright.config.ts

@@ -13,6 +13,9 @@ const htmlReportOutputFolder = path.join(artifactRoot, "report");
 const configuredWorkers = Number(process.env.PLAYWRIGHT_WORKERS || 2);
 const workers = Number.isFinite(configuredWorkers) && configuredWorkers > 0 ? configuredWorkers : 2;
 const reporterMode = (process.env.PLAYWRIGHT_REPORTER_MODE || "").trim();
+const configuredVideoMode = (process.env.PLAYWRIGHT_VIDEO_MODE || "retain-on-failure").trim();
+const allowedVideoModes = new Set(["off", "on", "retain-on-failure", "on-first-retry"]);
+const videoMode = allowedVideoModes.has(configuredVideoMode) ? configuredVideoMode : "retain-on-failure";
 const reporter =
   reporterMode === "line-html"
     ? [["line"], ["html", { open: "never", outputFolder: htmlReportOutputFolder }]]
@@ -59,7 +62,7 @@ export default defineConfig({
     baseURL,
     trace: "retain-on-failure",
     screenshot: "only-on-failure",
-    video: "retain-on-failure",
+    video: videoMode,
   },
   projects: [
     buildProject("chromium-mobile", "chromium", "Pixel 5"),