On touch, a tap on a post opens its thread

On a phone the only way into a post's thread was a small Expand button (and now an entry in More), while a tap on the
post pinned it to a globe that is usually hidden there, outlining the card. Where the pointer can't hover, a tap on a
post that isn't on its links, controls or menus and doesn't end a text selection opens its thread through the card's
own thread link (main.js, data-thread on the card); cards are pinned to the globe with a mouse only. The globe's corner
stats have 12px text on touch. Phone flow: a tap in a post's margin opens its thread and pins nothing.

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

tests/e2e/Mobile/FlowTests.cs

@@ -262,6 +262,21 @@ namespace decePubClient.E2E.Mobile
 			}
 		}
 
+		// a tap on a post (in its margin, not on a link or a control) opens its thread
+		[Fact]
+		public async Task A_tap_on_a_post_opens_its_thread()
+		{
+			await using var session = await SignIn.As(browser, Persona(), Phone);
+			await Flow(session, "thread", async page =>
+			{
+				var card = Card(page, "a[data-thread-link]");
+				var box = (await card.BoundingBoxAsync())!;
+				await card.TapAsync(new() { Position = new() { X = box.Width - 5, Y = box.Height * 0.35f } });
+				await page.WaitForURLAsync(url => new Uri(url).AbsolutePath.StartsWith("/expand/"), new() { Timeout = 15000 });
+				Assert.Empty(await page.Locator("[data-globe-pinned]").AllAsync());
+			});
+		}
+
 		static async Task<JsonNode> Latest(Pasture.Persona persona) =>
 			(await PersonaApi.Call(persona, $"/api/v1/accounts/{persona.LocalId}/statuses?limit=1"))!.AsArray().FirstOrDefault();
 	}