Full mixer implementation — tray, popup, prefs, devices tab with port indicators

Adds the complete tmix feature set built since the initial skeleton:
balance knob, level meters, KLed mute button, system tray with scroll-wheel
volume and recording indicator, tray popup, preferences dialog, right-click
context menus, single-instance enforcement, scroll area, window geometry
persistence, and Devices tab with PA card profile switcher and live port
availability indicators (2-column layout, in-place updates on plug/unplug).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/ui/tmixapp.h b/src/ui/tmixapp.h
new file mode 100644
index 0000000..8f41245
--- /dev/null
+++ b/src/ui/tmixapp.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <kuniqueapplication.h>
+
+class MixerWindow;
+
+class TmixApp : public KUniqueApplication
+{
+    TQ_OBJECT
+public:
+    TmixApp();
+    int newInstance();
+    void setMainWindow( MixerWindow *w ) { m_win = w; }
+private:
+    MixerWindow *m_win;
+    bool         m_firstInstance;
+};