test(e2e): guard iPad-portrait widths against overflow and a squeezed column

e2e/ipad-viewport.spec.ts

@@ -0,0 +1,70 @@
+import { expect, test } from "@playwright/test";
+
+import { STORAGE_STATE_PATH } from "./setup/global-setup";
+
+/**
+ * iPad-width regression guard (portrait, 768×1024).
+ *
+ * Two invariants this viewport class kept losing:
+ *
+ *   1. No horizontal page overflow — the content column must shrink
+ *      below its children's intrinsic min width (`min-w-0` on the
+ *      shell column); wide children scroll inside their own
+ *      `overflow-x-auto` containers instead of widening the page.
+ *   2. The content column keeps its room: with no stored sidebar
+ *      preference, tablet widths start on the icon rail (w-16), so
+ *      `<main>` gets ~704 px of the 768 — not the 512 px left over
+ *      next to the expanded 256 px sidebar.
+ *
+ * Desktop project only — the assertions are viewport-driven via
+ * `setViewportSize`, and the Pixel-5 project covers the phone class.
+ */
+const ROUTES = ["/", "/measurements", "/settings/integrations"] as const;
+
+test.describe("iPad portrait layout (768x1024)", () => {
+  test.use({ storageState: STORAGE_STATE_PATH });
+
+  test.beforeEach(({}, testInfo) => {
+    test.skip(
+      testInfo.project.name !== "chromium-desktop",
+      "viewport-driven spec; desktop project only",
+    );
+  });
+
+  for (const route of ROUTES) {
+    test(`no horizontal overflow and full-width content on ${route}`, async ({
+      page,
+    }) => {
+      await page.setViewportSize({ width: 768, height: 1024 });
+      await page.goto(route, { waitUntil: "domcontentloaded" });
+      await page.waitForLoadState("networkidle");
+
+      const dims = await page.evaluate(() => ({
+        scrollWidth: document.documentElement.scrollWidth,
+        bodyScrollWidth: document.body.scrollWidth,
+        innerWidth: window.innerWidth,
+        mainWidth:
+          document
+            .querySelector("main")
+            ?.getBoundingClientRect()
+            .width.valueOf() ?? 0,
+      }));
+
+      // 1 px tolerance for sub-pixel rounding, matching the Pixel-5 spec.
+      expect(
+        dims.scrollWidth,
+        `page scrollWidth=${dims.scrollWidth}, innerWidth=${dims.innerWidth}`,
+      ).toBeLessThanOrEqual(dims.innerWidth + 1);
+      expect(
+        dims.bodyScrollWidth,
+        `body scrollWidth=${dims.bodyScrollWidth}`,
+      ).toBeLessThanOrEqual(dims.innerWidth + 1);
+
+      // Icon rail (64 px) + content: main must keep ≥ 690 px of the 768.
+      expect(
+        Math.round(dims.mainWidth),
+        `main width=${dims.mainWidth}`,
+      ).toBeGreaterThanOrEqual(690);
+    });
+  }
+});