Split ServerTab into focused collaborator classes

Extract mic/speaker/away/commander state handling into
ServerTabSelfState, ServerTreePanel.Actions delegation (context
menus, drag-drop, link clicks) into ServerTabTreeActions, and
ConnectionListener event marshaling onto the EDT into
ServerTabConnectionEvents. ServerTab keeps its full public API
(636 -> 377 lines); no behavior change.

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

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

@@ -0,0 +1,160 @@
+package com.ts3client.ui;
+
+import com.ts3client.net.ConnectionListener;
+import com.ts3client.net.TeamspeakConnection;
+
+import javax.swing.JOptionPane;
+import javax.swing.SwingUtilities;
+
+/**
+ * Marshals {@link ConnectionListener} callbacks onto the EDT and fans them out to
+ * this tab's views (tree, chat, info panel) and to {@link MainFrame}.
+ *
+ * <p>Constructed before the {@link TeamspeakConnection} it listens to exists — the
+ * connection's constructor needs a listener up front — so {@link #attach} wires the
+ * rest of the tab in once everything else has been built.
+ */
+final class ServerTabConnectionEvents implements ConnectionListener {
+
+    /** The handful of {@link ServerTab} fields this class updates but can't reach directly. */
+    interface Listener {
+        void setStatus(String status);
+
+        void setTitle(String title);
+
+        void setConnecting(boolean connecting);
+    }
+
+    private final MainFrame host;
+    private final ServerTab tab;
+    private final Listener listener;
+
+    private TeamspeakConnection conn;
+    private ServerTreePanel treePanel;
+    private ChatPanel chatPanel;
+    private ServerTabSelfState selfState;
+    private ServerTabTreeActions treeActions;
+
+    ServerTabConnectionEvents(MainFrame host, ServerTab tab, Listener listener) {
+        this.host = host;
+        this.tab = tab;
+        this.listener = listener;
+    }
+
+    void attach(TeamspeakConnection conn, ServerTreePanel treePanel, ChatPanel chatPanel,
+                ServerTabSelfState selfState, ServerTabTreeActions treeActions) {
+        this.conn = conn;
+        this.treePanel = treePanel;
+        this.chatPanel = chatPanel;
+        this.selfState = selfState;
+        this.treeActions = treeActions;
+    }
+
+    @Override
+    public void onStatus(String text) {
+        SwingUtilities.invokeLater(() -> {
+            listener.setStatus(text);
+            host.tabUpdated(tab);
+        });
+    }
+
+    @Override
+    public void onConnected() {
+        SwingUtilities.invokeLater(() -> {
+            listener.setConnecting(false);
+            treePanel.setSelfClientId(conn.getSelfClientId());
+            selfState.resetOnConnect();
+            chatPanel.setInputEnabled(true);
+            chatPanel.appendSystem("Connected.");
+            host.tabConnected(tab);
+        });
+    }
+
+    @Override
+    public void onDisconnected(String reason) {
+        SwingUtilities.invokeLater(() -> {
+            listener.setConnecting(false);
+            conn.getModel().clear();
+            treePanel.showDisconnected();
+            treeActions.clearSelection();
+            chatPanel.setInputEnabled(false);
+            chatPanel.closePrivateChats();
+            chatPanel.closeNoteTabs();
+            chatPanel.appendSystem("Disconnected" + (reason == null || reason.isEmpty() ? "." : ": " + reason));
+            host.tabDisconnected(tab);
+        });
+    }
+
+    @Override
+    public void onModelChanged() {
+        SwingUtilities.invokeLater(() -> {
+            treePanel.rebuild();
+            treeActions.renderInfo();
+            String name = conn.getModel().getServerName();
+            if (conn.isConnected() && name != null && !name.isBlank() && !name.equals(tab.title())) {
+                listener.setTitle(name);
+                host.tabUpdated(tab);
+            }
+        });
+    }
+
+    @Override
+    public void onInfoUpdated() {
+        SwingUtilities.invokeLater(treeActions::renderInfo);
+    }
+
+    @Override
+    public void onIconsUpdated() {
+        SwingUtilities.invokeLater(() -> {
+            treePanel.refreshRowSizes();
+            treeActions.renderInfo();
+        });
+    }
+
+    @Override
+    public void onChat(ChatScope scope, int fromClientId, String fromName, String message) {
+        switch (scope) {
+            case PRIVATE:
+                chatPanel.appendPrivateMessage(fromClientId, fromName, fromClientId, fromName, message);
+                break;
+            case SERVER:
+                chatPanel.appendServerMessage(fromClientId, fromName, message);
+                break;
+            default:
+                chatPanel.appendChannelMessage(fromClientId, fromName, message);
+                break;
+        }
+    }
+
+    @Override
+    public void onTalkStateChanged(int clientId, boolean talking) {
+        SwingUtilities.invokeLater(() -> {
+            treePanel.refreshVisual();
+            if (clientId == conn.getSelfClientId()) host.selfStateChanged(tab);
+        });
+    }
+
+    @Override
+    public void onError(String message) {
+        SwingUtilities.invokeLater(() -> {
+            chatPanel.appendSystem("Error: " + message);
+            listener.setStatus(message);
+            host.tabUpdated(tab);
+        });
+    }
+
+    @Override
+    public void onServerLog(String message) {
+        SwingUtilities.invokeLater(() -> chatPanel.appendServerLog(message));
+    }
+
+    @Override
+    public void onPoke(String fromName, String message) {
+        SwingUtilities.invokeLater(() -> {
+            chatPanel.appendSystem("You were poked by " + fromName + ": " + message);
+            host.selectTab(tab);
+            JOptionPane.showMessageDialog(host, fromName + " poked you:\n\n" + message,
+                    "Poke", JOptionPane.INFORMATION_MESSAGE);
+        });
+    }
+}