chatgui: add diagnostic logging for Windows emoji animation bug investigation

tools/chatgui/src/emojipanel.cpp

@@ -3,6 +3,7 @@
 #include "emojitabbar.h"
 #include "animtimer.h"
 #include "lottieicon.h"
+#include <cstdio>
 #include <QPushButton>
 #include <QScrollArea>
 #include <QTabWidget>
@@ -34,6 +35,8 @@ public:
         if (data.type == EmojiType::Animation) {
             setMouseTracking(true);
             m_icon = AnimTimer::instance()->icon(data.animPath);
+            fprintf(stderr, "[DIAG EmojiBtn] btn=%p path=%s m_icon=%p\n",
+                    (void*)this, qPrintable(data.animPath), (void*)m_icon);
             m_timer.setInterval(33);
             connect(&m_timer, &QTimer::timeout, this, [this]() {
                 if (m_icon && m_icon->isValid()) {