Lite and Viewer: grid and list row actions are double-click only, with no keyboard path in source #4693

Found by the source accessibility audit (lane X, from source). Each grid or list below opens its detail or history through a MouseDoubleClick handler and nothing else. No KeyDown/Enter handler, InputBindings or command was found for any of them in source (context-menu duplicates of the same action were not checked). A keyboard or UI Automation user can select the row but cannot open it.

Lite

• Lite/MainWindow.xaml:267 ServerListView (opens the server tab)
• Lite/Controls/ServerTab.xaml:504 QueryStatsGrid, :806 ProcedureStatsGrid, :1013 QueryStoreGrid, :1726 BlockedProcessReportGrid, :1837 DeadlockGrid, :2527 CollectionHealthGrid
• Lite/Controls/FinOpsTab.xaml:839 StorageGrowthDataGrid, :975 ObjectGrowthDetailGrid, :1068 IndexLockingDataGrid
• Lite/Controls/AlertsHistoryTab.xaml:109 AlertsDataGrid (opens alert detail)
• Lite/Windows/ManageCredentialProfilesDialog.xaml:26, Lite/Windows/ManageMuteRulesWindow.xaml:25, Lite/Windows/ManageServersWindow.xaml:47, Lite/Windows/SettingsWindow.xaml:788 (edit the row)

Darling Viewer

• Darling/PerformanceMonitor.Darling.Viewer/MainWindow.xaml:439 ServerList
• ViewerServerTab.xaml:2483 BlockedProcessReportGrid, :2596 DeadlockGrid, :3615 CollectionHealthGrid; ViewerServerTab.History.cs:47-50 (QueryStatsGrid, ProcedureStatsGrid, QueryStoreGrid, QueryStoreRegressionsGrid wired in code)
• FinOpsTab.xaml:538, :558, :613; AlertsHistoryTab.xaml:113
• ManageCredentialProfilesDialog.xaml:26, ManageServersWindow.xaml:48, MuteRulesWindow.xaml:35, NotificationRoutesWindow.xaml:36

Suggested fix

One shared behavior: an Enter (and Return) key handler on each of these grids that calls the same handler the double-click calls, plus an "Open" context-menu item where none exists. One attached behavior can cover all of them.