squash #6158 (#6160)

* move message_log_widget to game

* move files

* update headers

* fix cmakelists

* oracle fixes

* split implementation out to cpp

* fix recursive import

* fix main file

* format

cockatrice/src/interface/widgets/general/display/shadow_background_label.cpp

@@ -0,0 +1,63 @@
+#include "shadow_background_label.h"
+
+#include <QPaintEvent>
+#include <QPainter>
+
+/**
+ * @class ShadowBackgroundLabel
+ * @brief A QLabel with a semi-transparent black shadowed background and rounded corners.
+ *
+ * This label provides a styled appearance with centered white text and a translucent
+ * rounded background, making it suitable for overlay or emphasis in a UI.
+ */
+ShadowBackgroundLabel::ShadowBackgroundLabel(QWidget *parent, const QString &text) : QLabel(parent)
+{
+    setAttribute(Qt::WA_TranslucentBackground);                // Allows transparency.
+    setText("<font color='white'>" + text + "</font>");        ///< Ensures the text is rendered in white.
+    setAlignment(Qt::AlignCenter);                             ///< Centers the text within the label.
+    setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum); ///< Ensures minimum size constraints.
+}
+
+/**
+ * @brief Handles resizing of the label.
+ *
+ * Ensures the label updates its appearance when resized by triggering a repaint.
+ *
+ * @param event The resize event containing new size information.
+ */
+void ShadowBackgroundLabel::resizeEvent(QResizeEvent *event)
+{
+    QLabel::resizeEvent(event);
+    update(); // Repaint borders explicitly.
+}
+
+/**
+ * @brief Custom paint event for drawing the label's background.
+ *
+ * Renders a semi-transparent black rounded rectangle as the background
+ * and then delegates text rendering to QLabel.
+ *
+ * @param event The paint event for the widget.
+ */
+void ShadowBackgroundLabel::paintEvent(QPaintEvent *event)
+{
+    QPainter painter(this);
+
+    // Enable antialiasing for smoother edges.
+    painter.setRenderHint(QPainter::Antialiasing, true);
+
+    // Set semi-transparent black brush and disable border pen.
+    painter.setBrush(QColor(0, 0, 0, 128)); // Semi-transparent black.
+    painter.setPen(Qt::NoPen);              // No border.
+
+    // Adjust the rectangle to account for margins.
+    QRect adjustedRect = this->rect();
+    int margin = contentsMargins().left(); // Assuming equal margins.
+    adjustedRect.adjust(margin, margin, -margin, -margin);
+
+    // Draw a rounded rectangle with a corner radius of 5.
+    painter.drawRoundedRect(adjustedRect, 5, 5);
+
+    // Delegate text rendering to QLabel.
+    QLabel::paintEvent(event);
+}