Phone tests: expired sign-ins, evidence, and probes that only judge what can be tapped

A saved sign-in whose session expired landed on the login page and every route its persona opened timed out; both the
desktop and the phone sign-in now see that and sign in afresh. A route that fails to open leaves its screenshot and
text, as a failed sign-in does. A target's probes stay inside what its scroller shows (a card half under the feed's
top edge was failed for the part out of sight), a failed probe names what it hit, and the element blamed for sideways
scroll is never one inside a nested clipping box, which can't widen the page. The desktop guard reads its probe sizes
as a list.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

tests/e2e/Support/SignIn.cs

@@ -15,8 +15,12 @@ namespace decePubClient.E2E.Support
 			{
 				var known = await browser.Open(state);
 				await known.Page.GotoAsync(Pasture.Site + "/");
-				await known.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
-				return known;
+				if (!await Stale(known.Page))
+				{
+					await known.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+					return known;
+				}
+				await known.DisposeAsync();
 			}
 			var session = await browser.Open();
 			await Through(session.Page, persona);
@@ -34,13 +38,43 @@ namespace decePubClient.E2E.Support
 				await (await As(browser, persona)).DisposeAsync();
 			var session = await browser.Open(state, phone);
 			await session.Page.GotoAsync(Pasture.Site + "/");
-			await session.Page.EvaluateAsync("() => localStorage.removeItem('FeedFilter')");
-			await session.Page.GotoAsync(Pasture.Site + "/");
-			await session.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+			if (await Stale(session.Page))
+			{
+				// the saved sign-in has expired (the page went to /login): sign in again on a desktop and start over
+				await session.DisposeAsync();
+				await (await As(browser, persona, fresh: true)).DisposeAsync();
+				session = await browser.Open(state, phone);
+			}
+			try
+			{
+				await session.Page.GotoAsync(Pasture.Site + "/");
+				await session.Page.EvaluateAsync("() => localStorage.removeItem('FeedFilter')");
+				await session.Page.GotoAsync(Pasture.Site + "/");
+				await session.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+			}
+			catch
+			{
+				await Evidence(session.Page, $"signin-{phone.Key}-{persona.UserName}");
+				throw;
+			}
 			await session.AssertPhone();
 			return session;
 		}
 
+		static async Task<bool> Stale(IPage page)
+		{
+			var until = DateTime.UtcNow.AddSeconds(15);
+			while (DateTime.UtcNow < until)
+			{
+				if (new Uri(page.Url).AbsolutePath.StartsWith("/login"))
+					return true;
+				if (await page.Locator("article[data-uri], [data-feed-empty]").CountAsync() > 0)
+					return false;
+				await page.WaitForTimeoutAsync(250);
+			}
+			return false;
+		}
+
 		public static async Task Through(IPage page, Pasture.Persona persona)
 		{
 			try