chatgui: rlottie animated emoji with hover-to-animate, drag-to-select

- Add LottieIcon class (TGS gzip decompress + rlottie C API render)
- Add AnimTimer singleton (33ms tick, activate/deactivate refcount)
- Add EmojiButton (hover-triggered animation in emoji picker)
- Add AnimatedEmoji support to EmojiData (5 TGS mappings)
- MessageDelegate: QTextLayout-based animated emoji overlay (text + reactions)
- ChatView: drag-to-select (click deselects, 5px drag starts selection)
- ChatView: hoveredIndexChanged signal for hover-triggered animations
- MessageList: wire AnimTimer tick to viewport update, hover → activate
- CMake: AUTORCC, rlottie, zlib dependencies
- Add 5 TGS animations as Qt resources

tools/chatgui/src/inputbar.cpp

@@ -1,10 +1,11 @@
 #include "inputbar.h"
 #include "emojipanel.h"
+#include "debug_ui.h"
+#include <QDebug>
 #include <QTextEdit>
 #include <QPushButton>
 #include <QHBoxLayout>
 #include <QFileDialog>
-#include <QDebug>
 #include <QKeyEvent>
 #include <QFontMetrics>
 #include <QScrollBar>
@@ -117,7 +118,11 @@ void InputBar::adjustInputHeight() {
 }
 
 void InputBar::onSendClicked() {
-    QString text = m_input->toPlainText().trimmed();
+    QString text = m_input->toPlainText();
+    GUI_INFO("send: len=%d hasLF=%d text='%s'",
+             text.length(), text.contains('\n'), qPrintable(text));
+    while (!text.isEmpty() && (text.back() == ' ' || text.back() == '\t'))
+        text.chop(1);
     if (text.isEmpty()) return;
     emit sendMessage(text);
     m_input->clear();