Show the local client's state in the system tray

The icon carries the badge the tree draws next to our own nickname on the
active server — idle, talking, away, commander, microphone or speakers
muted — and clicking it brings the window back to the front. Right click
offers "Show TS3J" and "Quit".

AWT's tray icon cannot be transparent on X11: the toolkit embeds a window
of the screen's default, opaque visual and fills it with a background
colour before drawing the image, so every icon sits in a box. Panels that
can show transparent icons advertise an ARGB visual instead, so the icon
is docked by hand over the system tray protocol, in that visual, with the
image put on the window premultiplied. AWT's own icon stays as the
fallback for everything else.

Two details a panel will not forgive: an icon that publishes no size
hints is allocated a one-pixel sliver, and docking is a request, so an
icon that is never adopted has to hand over to the fallback rather than
sit invisible.

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

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

@@ -153,6 +153,18 @@ final class ServerTab implements ConnectionListener, ServerTreePanel.Actions {
         return commander;
     }
 
+    /** What the local client looks like on this server, for the tray icon. */
+    SelfState selfState() {
+        if (!conn.isConnected()) return SelfState.DISCONNECTED;
+        if (deafened) return SelfState.DEAFENED;
+        if (micMuted) return SelfState.MIC_MUTED;
+        if (away) return SelfState.AWAY;
+        ClientEntry self = conn.getModel().getClient(conn.getSelfClientId());
+        boolean talking = self != null && self.talking;
+        if (commander) return talking ? SelfState.COMMANDER_TALKING : SelfState.COMMANDER;
+        return talking ? SelfState.TALKING : SelfState.IDLE;
+    }
+
     /** Path of the channel we are in, or empty when not connected. */
     String currentChannelPath() {
         if (!conn.isConnected()) return "";
@@ -511,7 +523,10 @@ final class ServerTab implements ConnectionListener, ServerTreePanel.Actions {
 
     @Override
     public void onTalkStateChanged(int clientId, boolean talking) {
-        SwingUtilities.invokeLater(treePanel::refreshVisual);
+        SwingUtilities.invokeLater(() -> {
+            treePanel.refreshVisual();
+            if (clientId == conn.getSelfClientId()) host.selfStateChanged(this);
+        });
     }
 
     @Override