Log server activity, scrollable chat tabs, and move info panel to a chat tab

Native TS3 logs client joins/leaves/moves, group changes and channel edits
to the server tab; minor local-only notices (mic mute, tray) no longer
spam the log. Chat tabs scroll by mouse wheel like server tabs. The info
panel can now be moved into a persistent, generically-labelled chat tab
that tracks tree selection and collapses the panel's space entirely; a
tree rebuild no longer briefly fires a null selection that reset this.
Added "Find Client in Channel Tree" to the client context menu, and tree
selection now survives model rebuilds.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/MainFrame.java

@@ -132,7 +132,6 @@ public final class MainFrame extends JFrame implements ServerTabPane.Listener {
         selectTab(first);
         first.chat().appendSystem("Welcome to the TS3J Swing client.");
         first.chat().appendSystem("Use Connections → Connect to join a server.");
-        first.chat().appendSystem(tray.status());
 
         statusTimer = new javax.swing.Timer(3000, e -> updateConnectionStatus());
         statusTimer.start();