Name the server node and stop it collapsing

The tree's top row showed the placeholder name, since nothing ever read the
real one; take it from initserver, which ts3j now keeps.

There is only ever one top-level row, so its expand control bought nothing and
cost horizontal space in a narrow view. Drop it, ignore collapse requests on
the root, and tighten the per-level indent.

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

ts3-client/core/src/main/java/com/ts3client/net/TeamspeakConnection.java

@@ -338,6 +338,8 @@ public final class TeamspeakConnection implements TS3Listener {
         } catch (Exception e) {
             ui.onStatus("Limited subscription: " + rootMessage(e));
         }
+        // The name comes with initserver; servergetvariables never reports it.
+        model.setServerName(client.getServerName());
         try {
             for (Channel ch : client.listChannels()) {
                 model.putChannel(ch.getId(), ch.getName(), ch.getParentChannelId(), ch.getOrder());

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

@@ -14,6 +14,7 @@ import javax.swing.JTree;
 import javax.swing.JViewport;
 import javax.swing.SwingUtilities;
 import javax.swing.TransferHandler;
+import javax.swing.plaf.basic.BasicTreeUI;
 import javax.swing.tree.DefaultMutableTreeNode;
 import javax.swing.tree.DefaultTreeModel;
 import javax.swing.tree.DefaultTreeCellRenderer;
@@ -97,7 +98,15 @@ public final class ServerTreePanel extends JScrollPane {
         root.setUserObject("Not connected");
         this.tree = new DropIndicatorTree(treeModel);
         tree.setRootVisible(true);
-        tree.setShowsRootHandles(true);
+        // The server node is the only top-level row and always stays open, so it gets
+        // no expand control. Nesting is tightened too: horizontal space in this view
+        // is scarce and channel names are long.
+        tree.setShowsRootHandles(false);
+        if (tree.getUI() instanceof BasicTreeUI) {
+            BasicTreeUI ui = (BasicTreeUI) tree.getUI();
+            ui.setLeftChildIndent(4);
+            ui.setRightChildIndent(10);
+        }
         tree.setRowHeight(20);
         tree.setBackground(Theme.TREE_BG);
         tree.setFont(Theme.UI_FONT);
@@ -437,6 +446,13 @@ public final class ServerTreePanel extends JScrollPane {
             super(model);
         }
 
+        /** Keeps the server row permanently open; collapsing it would hide everything. */
+        @Override
+        public void setExpandedState(TreePath path, boolean state) {
+            if (!state && path.getPathCount() == 1) return;
+            super.setExpandedState(path, state);
+        }
+
         /**
          * Widens every repaint request to the full visible width. Swing only asks for
          * the row rectangle, which stops short of the right-aligned icon strip and would