Tests click exactly what they mean

A card's time is a "Post" button now (its nerd stats open with a tap), so the poll test submits through the composer's
own submit button instead of the last button named Post; the feed-memory test opens a thread from the Expand button,
not from the first expand/ link, which on a desktop is now the phone-only Thread entry. The Back flow presses Back with
history.back(): a Back held to close an overlay loads nothing, which GoBackAsync waited for.

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

tests/e2e/Mobile/FlowTests.cs

@@ -327,10 +327,12 @@ namespace decePubClient.E2E.Mobile
 				await page.WaitForURLAsync(url => new Uri(url).AbsolutePath == "/");
 				await page.Locator("#feed-scroll article[data-uri]").First.WaitForAsync();
 
+				// (history.back(), as the Back button does: a Back held to close an overlay loads nothing, which GoBackAsync would
+				// wait for)
 				async Task BackCloses(ILocator open, string what)
 				{
 					await Assertions.Expect(open).ToBeVisibleAsync();
-					await page.GoBackAsync();
+					await page.EvaluateAsync("() => history.back()");
 					await Assertions.Expect(open).ToBeHiddenAsync(new() { Timeout = 5000 });
 					Assert.True(new Uri(page.Url).AbsolutePath == "/", $"Back after the {what} left the feed for {page.Url}");
 				}
@@ -350,7 +352,7 @@ namespace decePubClient.E2E.Mobile
 				await BackCloses(page.Locator("aside[role=dialog]"), "full-screen globe");
 
 				// with nothing open, Back leaves the feed as before
-				await page.GoBackAsync();
+				await page.EvaluateAsync("() => history.back()");
 				await page.WaitForURLAsync(url => new Uri(url).AbsolutePath == "/explore", new() { Timeout = 10000 });
 			});
 		}