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.

Models/AttentionAlert.cs

@@ -8,10 +8,11 @@ namespace ytLive.Models;
 /// becomes dismissible — and its dismissal permanent — once ownership is verified).</para>
 /// <para>Clicking a row runs its action: the licence indicator opens About; an event alert opens the
 /// Logs tab with that event's lines highlighted.</para>
+/// <para>Rows are text only — a heading line above the message was redundant and pushed the stack past
+/// its two-line budget (creator, 2026-11-05).</para>
 /// </summary>
 public sealed record AttentionAlert(
     string Id,
-    string Label,
     string Text,
     bool IsPinned,
     AttentionAlertAction Action,