fix(splash): skip runtime title/version draw and use mantle background

The splash PNG already has the title and version baked in by
generate-splash.py, but SplashScreen::splashImage() was drawing them
again at position (6,75) which fell outside the rounded background
rectangle (starts at 30,30). Skip runtime text rendering for Kindred
Create while keeping the dev build warning.

Also switch the splash background from Catppuccin Mocha base (#1e1e2e)
to mantle (#181825) for a darker appearance and regenerate assets.

src/Gui/SplashScreen.cpp

@@ -360,9 +360,6 @@ QPixmap SplashScreen::splashImage()
         fontExe.setPointSizeF(20.0);
         QFontMetrics metricExe(fontExe);
         int l = QtTools::horizontalAdvance(metricExe, title);
-        if (title == QLatin1String("Kindred Create")) {
-            // For Kindred Create splash, we draw the title as part of the dynamic rendering
-        }
         int w = splash_image.width();
         int h = splash_image.height();
 
@@ -386,13 +383,16 @@ QPixmap SplashScreen::splashImage()
         QColor color(QString::fromStdString(tc->second));
         if (color.isValid()) {
             painter.setPen(color);
-            painter.setFont(fontExe);
-            if (title != QLatin1String("FreeCAD")) {
-                // FreeCAD's Splashscreen already contains the EXE name, no need to draw it
-                painter.drawText(x, y, title);
+            if (title != QLatin1String("Kindred Create")) {
+                // Kindred Create's splash PNG already contains the title and version
+                painter.setFont(fontExe);
+                if (title != QLatin1String("FreeCAD")) {
+                    // FreeCAD's Splashscreen already contains the EXE name, no need to draw it
+                    painter.drawText(x, y, title);
+                }
+                painter.setFont(fontVer);
+                painter.drawText(x + (l + 235), y - 7, version);
             }
-            painter.setFont(fontVer);
-            painter.drawText(x + (l + 235), y - 7, version);
             QColor warningColor(QString::fromStdString(wc->second));
             if (suffix == QLatin1String("dev") && warningColor.isValid()) {
                 fontVer.setPointSizeF(14.0);