Fix RDP key repeat: forward auto-repeat presses to the remote server

RdpDisplayWidget::keyPressEvent() dropped every event where
QKeyEvent::isAutoRepeat() was true, which discards the entire repeat
stream Qt generates while a key is held -- so holding a key only ever
produced a single keystroke on the remote machine. Auto-repeat presses
need to reach the remote server so it can perform its own typematic
repeat, exactly as a physical keyboard held down would; only release
events should filter isAutoRepeat() (kept as-is), since Qt uses a
synthetic release/press pair purely to normalize platform auto-repeat
quirks, and forwarding that synthetic release would send a spurious
key-up for a key still physically held.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/rdp_display_widget.cpp

@@ -147,10 +147,16 @@ void RdpDisplayWidget::resizeEvent(QResizeEvent* event)
 
 void RdpDisplayWidget::keyPressEvent(QKeyEvent* event)
 {
-    if (event == nullptr || event->isAutoRepeat()) {
+    if (event == nullptr) {
         return;
     }
 
+    // Auto-repeat presses must reach the remote server so it can perform
+    // its own typematic repeat, exactly as a physical keyboard held down
+    // would. Only release events filter out isAutoRepeat() (below), since
+    // Qt uses a synthetic release/press pair purely to normalize platform
+    // auto-repeat quirks -- forwarding that synthetic release would send a
+    // spurious key-up for a key that is still physically held.
     emit keyInput(event->key(),
                   event->nativeScanCode(),
                   event->text(),