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/chatview.cpp

@@ -1,10 +1,16 @@
 #include "chatview.h"
+#include "messagedelegate.h"
 #include <QPainter>
+#include <QClipboard>
+#include <QApplication>
 #include <QDebug>
+#include <QMouseEvent>
+#include <QKeyEvent>
 
 ChatView::ChatView(QWidget *parent)
     : QListView(parent)
 {
+    setMouseTracking(true);
 }
 
 void ChatView::setBackgroundImage(const QString &path) {
@@ -32,3 +38,113 @@ void ChatView::paintEvent(QPaintEvent *event) {
     }
     QListView::paintEvent(event);
 }
+
+bool ChatView::isRowSelected(const QModelIndex &idx) const {
+    if (!m_selStart.isValid() || !m_selEnd.isValid() || !idx.isValid())
+        return false;
+    int r = idx.row();
+    int a = m_selStart.row();
+    int b = m_selEnd.row();
+    if (a > b) qSwap(a, b);
+    return r >= a && r <= b;
+}
+
+void ChatView::mousePressEvent(QMouseEvent *event) {
+    if (event->button() != Qt::LeftButton) {
+        QListView::mousePressEvent(event);
+        return;
+    }
+    if (hasSelection()) {
+        m_selStart = QPersistentModelIndex();
+        m_selEnd   = QPersistentModelIndex();
+        m_textSel  = ChatTextSelection{};
+        m_selecting = false;
+        viewport()->update();
+    }
+    QModelIndex idx = indexAt(viewport()->mapFrom(this, event->pos()));
+    m_pressIndex = QPersistentModelIndex(idx);
+    m_pressPos = event->pos();
+    event->accept();
+}
+
+void ChatView::mouseMoveEvent(QMouseEvent *event) {
+    if (!m_selecting && m_pressIndex.isValid()) {
+        int dx = event->pos().x() - m_pressPos.x();
+        int dy = event->pos().y() - m_pressPos.y();
+        if (dx * dx + dy * dy >= 25) {
+            m_selStart = m_pressIndex;
+            m_selEnd   = m_pressIndex;
+            m_selecting = true;
+            QRect r = visualRect(QModelIndex(m_pressIndex));
+            m_textSel.index    = m_pressIndex;
+            m_textSel.clickPos = m_pressPos - r.topLeft();
+            m_textSel.dragPos  = m_textSel.clickPos;
+            m_textSel.active   = true;
+            viewport()->update();
+        }
+    }
+    if (!m_selecting) {
+        QModelIndex idx = indexAt(viewport()->mapFrom(this, event->pos()));
+        if (idx != QModelIndex(m_lastHovered)) {
+            m_lastHovered = idx;
+            emit hoveredIndexChanged(idx);
+        }
+    }
+    if (!m_selecting) {
+        QListView::mouseMoveEvent(event);
+        return;
+    }
+    QModelIndex idx = indexAt(viewport()->mapFrom(this, event->pos()));
+    if (idx.isValid()) {
+        m_selEnd = idx;
+    }
+    if (m_textSel.active) {
+        QRect r = visualRect(QModelIndex(m_textSel.index));
+        m_textSel.dragPos = event->pos() - r.topLeft();
+    }
+    viewport()->update();
+    event->accept();
+}
+
+void ChatView::mouseReleaseEvent(QMouseEvent *event) {
+    if (event->button() == Qt::LeftButton && m_selecting) {
+        m_selecting = false;
+        viewport()->update();
+    }
+    m_pressIndex = QPersistentModelIndex();
+    QListView::mouseReleaseEvent(event);
+}
+
+void ChatView::keyPressEvent(QKeyEvent *event) {
+    if (event == QKeySequence::Copy) {
+        copySelection();
+        return;
+    }
+    QListView::keyPressEvent(event);
+}
+
+void ChatView::copySelection() {
+    if (!hasSelection()) return;
+    auto *m = model();
+    if (!m) return;
+
+    if (selStart() == selEnd()) {
+        QModelIndex idx(selStart());
+        QString text = idx.data(MsgTextRole).toString();
+        if (m_textSel.startChar >= 0 && m_textSel.endChar > m_textSel.startChar)
+            text = text.mid(m_textSel.startChar, m_textSel.endChar - m_textSel.startChar);
+        QApplication::clipboard()->setText(text);
+    } else {
+        QString r;
+        int a = selStart().row(), b = selEnd().row();
+        if (a > b) qSwap(a, b);
+        for (int i = a; i <= b; ++i) {
+            QModelIndex idx = m->index(i, 0);
+            if (!r.isEmpty()) r += '\n';
+            r += '[' + idx.data(MsgTimeRole).toString() + "] ";
+            r += idx.data(MsgAuthorRole).toString() + ": ";
+            r += idx.data(MsgTextRole).toString();
+        }
+        QApplication::clipboard()->setText(r);
+    }
+}