feat: add project-aware agent workspace

tests/browser/support/reading-geometry.ts

@@ -0,0 +1,20 @@
+import type { Locator, TestInfo } from "@playwright/test";
+
+/** Measure the actual reading surface so density changes can be compared with screenshots. */
+export async function captureReadingGeometry(workspace: Locator, testInfo: TestInfo) {
+  const geometry = await workspace.evaluate((element) => {
+    const scroll = element.querySelector("[data-reading-scroll]")!;
+    const metrics = element.querySelector(".answer-ui-stack-comparison")!;
+    const chart = element.querySelector('.answer-ui-chart [role="img"]')!;
+    const bounds = scroll.getBoundingClientRect();
+    return {
+      viewportWidth: window.innerWidth,
+      readingWidth: Math.round(bounds.width),
+      metricsHeight: Math.round(metrics.getBoundingClientRect().height),
+      chartOffset: Math.round(chart.getBoundingClientRect().top - bounds.top + scroll.scrollTop),
+      horizontalOverflow: document.documentElement.scrollWidth > window.innerWidth,
+    };
+  });
+  await testInfo.attach("reading-geometry", { body: JSON.stringify(geometry, null, 2), contentType: "application/json" });
+  return geometry;
+}