Global hotkeys, in TeamSpeak's own shape

Bindings are captured system-wide rather than only while the window has
focus: X11's RECORD extension where the X server sees every key, and a
/dev/input reader as the Wayland fallback. Any key can act as a modifier,
mouse buttons included, as TS3 allows.

The action catalogue, its three categories and the "advanced actions"
split are reverse-engineered from the original client; actions this
client cannot perform are listed but greyed out. Push-to-talk becomes one
of these hotkeys, so the old focus-bound pushToTalkKey setting is gone and
the Voice Activation button edits that binding instead.

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

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

@@ -15,6 +15,8 @@ import javax.swing.JComponent;
 import javax.swing.JOptionPane;
 import javax.swing.JSplitPane;
 import javax.swing.SwingUtilities;
+import java.util.ArrayList;
+import java.util.List;
 import java.awt.Component;
 
 /**
@@ -319,6 +321,33 @@ final class ServerTab implements ConnectionListener, ServerTreePanel.Actions {
         return c != null ? c.nickname : "Client " + clientId;
     }
 
+    /** Joins the channel at a "/"-separated path, as the hotkey action names it. */
+    void joinChannelPath(String path) {
+        if (!conn.isConnected() || path == null || path.isBlank()) return;
+        ChannelNode target = conn.getModel().findChannelByPath(path);
+        if (target != null) conn.joinChannel(target.id, null);
+    }
+
+    /** Every channel of this server as a "/"-separated path, in the tree's own order. */
+    List<String> channelPaths() {
+        List<String> out = new ArrayList<>();
+        if (!conn.isConnected()) return out;
+        for (ChannelNode root : conn.getModel().buildTree()) collectPaths(root, out);
+        return out;
+    }
+
+    private void collectPaths(ChannelNode channel, List<String> out) {
+        out.add(conn.getModel().channelPath(channel.id));
+        for (ChannelNode child : channel.children) collectPaths(child, out);
+    }
+
+    /** The channel we are in, or null when not connected. */
+    ChannelNode currentChannel() {
+        if (!conn.isConnected()) return null;
+        ClientEntry self = conn.getModel().getClient(conn.getSelfClientId());
+        return self == null ? null : conn.getModel().getChannel(self.channelId);
+    }
+
     // ---- ServerTreePanel.Actions ----
 
     @Override