Fix screen reader button accessibility and category navigation (#4944)

* Fix UI automation peer wrapping and category focusability

* Add accessibility name to SettingsButton

* Avoid nesting ScrollViewer in generated panels with outer viewers

Inspect targetGrid and its parent hierarchy in Invoke-WPFUIElements to avoid adding an inner ScrollViewer when an outer ScrollViewer already exists.

pester/lazy-tabs.Tests.ps1

@@ -138,4 +138,11 @@ Describe "Startup lazy tab wiring" {
         $rendererScript | Should -Match '(?s)if \(\$entryInfo\.Link\).*\$textBlock\.Add_MouseUp\(\{.*Start-Process \$Sender\.ToolTip -ErrorAction Stop'
         $mainScript | Should -Not -Match '\.Name\.EndsWith\("Link"\)'
     }
+
+    It "checks for an existing outer ScrollViewer before nesting an inner ScrollViewer" {
+        $rendererScript = Get-Content -Path (Join-Path $script:repoRoot "functions\public\Invoke-WPFUIElements.ps1") -Raw
+
+        $rendererScript | Should -Match '\$hasOuterScrollViewer'
+        $rendererScript | Should -Match 'if\s*\(\$hasOuterScrollViewer\)'
+    }
 }