fix: preserve selected row when updating ping status

Maintain the current server selection when ping or ping all operations
update the server list. Previously, the selection would reset to the
first item after each update.

Author: tan9

internal/adapters/ui/server_list.go

@@ -55,13 +55,21 @@ func (sl *ServerList) build() {
 }
 
 func (sl *ServerList) UpdateServers(servers []domain.Server) {
+	// Save current selection before clearing
+	currentIdx := sl.List.GetCurrentItem()
+	var currentAlias string
+	if currentIdx >= 0 && currentIdx < len(sl.servers) {
+		currentAlias = sl.servers[currentIdx].Alias
+	}
+
 	sl.servers = servers
 	sl.List.Clear()
 
 	// Get current width
 	_, _, width, _ := sl.List.GetInnerRect() //nolint:dogsled
 	sl.currentWidth = width
 
+	newSelectedIdx := -1
 	for i := range servers {
 		primary, secondary := formatServerLine(servers[i], width)
 		idx := i
@@ -70,12 +78,24 @@ func (sl *ServerList) UpdateServers(servers []domain.Server) {
 				sl.onSelection(sl.servers[idx])
 			}
 		})
+		// Track the new index of previously selected server
+		if currentAlias != "" && servers[i].Alias == currentAlias {
+			newSelectedIdx = i
+		}
 	}
 
 	if sl.List.GetItemCount() > 0 {
-		sl.List.SetCurrentItem(0)
-		if sl.onSelectionChange != nil {
-			sl.onSelectionChange(sl.servers[0])
+		// Restore previous selection if found, otherwise keep first item
+		if newSelectedIdx >= 0 {
+			sl.List.SetCurrentItem(newSelectedIdx)
+			if sl.onSelectionChange != nil {
+				sl.onSelectionChange(sl.servers[newSelectedIdx])
+			}
+		} else {
+			sl.List.SetCurrentItem(0)
+			if sl.onSelectionChange != nil {
+				sl.onSelectionChange(sl.servers[0])
+			}
 		}
 	}
 }