refactor(ui): alert rows are two lines of text — the heading line was redundant

Creator: system messages are limited to two lines; the label above the message ('STEAM ID NOT
PRESENT', 'STREAM') was repeating what the row already said and pushing the stack past its budget.

AttentionAlert loses Label; rows render Text only. The licence row is now exactly:
    Steam ID Limit: 30fps
    Click for More Info
(60fps with a close control once owned). Rows are identified by Id internally, so nothing in the UI
depends on the removed text. Tests updated to assert position/text rather than the heading.

ytLive.Tests/AboutHubTests.cs

@@ -99,7 +99,7 @@ public sealed class AboutHubTests
                 // The old red panel under the quality picker is gone (2026-11-05): the licence state
                 // lives in the left panel's alert stack now, as a pinned status indicator.
                 Assert.Null(window.FindName("EntitlementErrorPanel"));
-                var licenceRow = vm.AttentionAlerts.Single(alert => alert.Label == "STEAM ID NOT PRESENT");
+                var licenceRow = vm.AttentionAlerts.Single(alert => alert.Id == "steam-licence");
                 Assert.True(licenceRow.IsPinned);
                 Assert.Contains("Steam ID Limit: 30fps", licenceRow.Text);
                 Assert.Contains("Click for More Info", licenceRow.Text);

ytLive.Tests/AttentionAlertStackTests.cs

@@ -32,11 +32,13 @@ public sealed class AttentionAlertStackTests
             vm.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");
 
             var row = Assert.Single(vm.AttentionAlerts);
-            Assert.Equal("STEAM ID NOT PRESENT", row.Label);
+            Assert.Equal("steam-licence", row.Id);
             Assert.True(row.IsPinned);
             Assert.True(row.ShowsPin);
             Assert.False(row.CanDismiss);
             Assert.Equal(AttentionAlertAction.About, row.Action);
+            // Two lines at most: the heading above the message was redundant.
+            Assert.DoesNotContain("\n\n", row.Text);
 
             // Creator wording: the limit this build runs at, and where to find out why.
             Assert.Contains("Steam ID Limit: 30fps", row.Text);
@@ -63,11 +65,11 @@ public sealed class AttentionAlertStackTests
 
             // Permanent: a fresh view-model on the same profile must not bring it back…
             var reloaded = new MainViewModel();
-            Assert.DoesNotContain(reloaded.AttentionAlerts, alert => alert.Label.StartsWith("STEAM ID"));
+            Assert.DoesNotContain(reloaded.AttentionAlerts, alert => alert.Id == "steam-licence");
 
             // …but losing ownership restores it as a pinned indicator: a change of state, not a preference.
             reloaded.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");
-            var restored = reloaded.AttentionAlerts.First(alert => alert.Label == "STEAM ID NOT PRESENT");
+            var restored = reloaded.AttentionAlerts.First(alert => alert.Id == "steam-licence");
             Assert.True(restored.IsPinned);
         });
     }
@@ -90,22 +92,22 @@ public sealed class AttentionAlertStackTests
         WithVm(vm =>
         {
             vm.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");
-            vm.PushAttentionAlertForTest("drop-1", "STREAM", "Stream dropped — reconnecting (attempt 1 of 4)", 10, 12);
-            vm.PushAttentionAlertForTest("drop-2", "STREAM", "Stream dropped — reconnecting (attempt 2 of 4)", 13, 15);
+            vm.PushAttentionAlertForTest("drop-1", "Stream dropped — reconnecting (attempt 1 of 4)", 10, 12);
+            vm.PushAttentionAlertForTest("drop-2", "Stream dropped — reconnecting (attempt 2 of 4)", 13, 15);
 
-            Assert.Equal(new[] { "STEAM ID NOT PRESENT", "STREAM", "STREAM" }, vm.AttentionAlerts.Select(a => a.Label));
+            Assert.Equal(new[] { "steam-licence", "drop-2", "drop-1" }, vm.AttentionAlerts.Select(a => a.Id));
             // Newest event sits directly under the indicator.
             Assert.Contains("attempt 2", vm.AttentionAlerts[1].Text);
             Assert.Contains("attempt 1", vm.AttentionAlerts[2].Text);
 
             // The same event advancing updates its row instead of adding another.
-            vm.PushAttentionAlertForTest("drop-2", "STREAM", "Stream recovered after 1.4 s", 13, 16);
+            vm.PushAttentionAlertForTest("drop-2", "Stream recovered after 1.4 s", 13, 16);
             Assert.Equal(3, vm.AttentionAlerts.Count);
             Assert.Contains("recovered", vm.AttentionAlerts[1].Text);
 
             vm.DismissAlertCommand.Execute(vm.AttentionAlerts[1]);
             Assert.Equal(2, vm.AttentionAlerts.Count);
-            Assert.Equal("STEAM ID NOT PRESENT", vm.AttentionAlerts[0].Label);
+            Assert.Equal("steam-licence", vm.AttentionAlerts[0].Id);
         });
     }
 
@@ -114,7 +116,7 @@ public sealed class AttentionAlertStackTests
     {
         WithVm(vm =>
         {
-            vm.PushAttentionAlertForTest("drop-1", "STREAM", "Stream dropped", 41, 47);
+            vm.PushAttentionAlertForTest("drop-1", "Stream dropped", 41, 47);
 
             vm.ActivateAlertCommand.Execute(vm.AttentionAlerts[1]);