A11y: set explicit AutomationName on CompactSummary header button and body

In the CompactSummary tool-burst style, the header is a standalone Button
and the expanded body (step rows) is a sibling element outside the Button's
automation subtree. This meant Narrator only announced the button's visual
content (a FlexRow with text nodes that may not compose cleanly) without
context about the task state.

Changes:
- Build a headerAutomationName string: "<summary>, <N step(s)>, <status>,
  expanded/collapsed" and pass it to .AutomationName() on headerButton.
  Narrator now announces the full card state when the button is focused.
- Add .AutomationName("Tool steps for: <summary>") on the body Border so
  scan-mode navigation gives the body region a clear label linking it back
  to the task the header describes.

Fixes #590

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

src/OpenClaw.Tray.WinUI/Chat/OpenClawChatTimeline.cs

@@ -2053,7 +2053,18 @@ string Truncate(string s, int max)
                         .Set(t => { t.FontSize = 11; }).VAlign(VerticalAlignment.Center)
                 ) with { ColumnGap = 8 }).Margin(0, 0, 0, 0);
 
-                var headerButton = Button(headerContent, toggleTaskList).Set(b =>
+                // A11y: provide an explicit automation name so Narrator announces
+                // the full card state when the header button is focused. The body
+                // content sits outside the Button's automation subtree (it is a
+                // sibling, not a child), so the button name must summarise the
+                // entire card — including task description, step count, and status.
+                var headerAutomationName = effectiveExpanded
+                    ? $"{summaryLine}, {stepCountLabel}, {taskStatusText}, expanded"
+                    : $"{summaryLine}, {stepCountLabel}, {taskStatusText}, collapsed";
+
+                var headerButton = Button(headerContent, toggleTaskList)
+                    .AutomationName(headerAutomationName)
+                    .Set(b =>
                 {
                     b.HorizontalAlignment = HorizontalAlignment.Stretch;
                     b.HorizontalContentAlignment = HorizontalAlignment.Stretch;
@@ -2072,8 +2083,11 @@ string Truncate(string s, int max)
                 {
                     // Body sits inside the same card; thin top border so the
                     // header + body read as one unit but the divide is clear.
+                    // A11y: label the body region so Narrator scan-mode users
+                    // understand its relationship to the header above it.
                     cardChildren.Add(
                         Border(VStack(8, stepRows.ToArray()))
+                            .AutomationName($"Tool steps for: {summaryLine}")
                             .Set(b =>
                             {
                                 b.Padding = bubblePadding;