Fix: Point Sunshine tray link at new tailnet domain

The tailnet's MagicDNS suffix changed from twhomelab.local to
twhomelab.tailnet, so the Sunshine web UI link now opens
xol.twhomelab.tailnet:47990.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dotfiles/.config/quickshell/modules/bar/PinnedTray.qml

@@ -32,7 +32,7 @@ RowLayout {
             icon: Qt.resolvedUrl("../../assets/sunshine.svg"),
             binary: "sunshine",
             launch: ["systemctl", "--user", "start", "app-dev.lizardbyte.app.Sunshine.service"],
-            secondary: ["xdg-open", "https://xol.twhomelab.local:47990"],
+            secondary: ["xdg-open", "https://xol.twhomelab.tailnet:47990"],
         },
     ]