Fix dark-theme backgrounds across device, HMS, and AMS UI on macOS

Give previously-bare panels a keyed background so the existing dark-UI walk
can theme them. Runtime-created widgets (HMS items, device firmware/nozzle
panels) route their whole subtree through one UpdateDarkUIWin(this) call
instead of per-widget darkModeColorFor, which also themes their child text
and follows live light/dark switches. Extruder-card chips re-apply their
colours from Sidebar::sys_color_changed so a live switch updates them too.

src/slic3r/GUI/DeviceTab/uiDeviceUpdateVersion.cpp

@@ -8,6 +8,7 @@
 #include "uiDeviceUpdateVersion.h"
 
 #include "slic3r/GUI/I18N.hpp"
+#include "slic3r/GUI/GUI_App.hpp"
 #include "slic3r/GUI/wxExtensions.hpp"
 #include "slic3r/GUI/Widgets/Label.hpp" // Orca: explicit Label include
 
@@ -27,6 +28,7 @@ uiDeviceUpdateVersion::uiDeviceUpdateVersion(wxWindow* parent,
                                              long style /*= wxTAB_TRAVERSAL*/)
      : wxPanel(parent, id, pos, size, style)
 {
+    SetBackgroundColour(*wxWHITE);
     CreateWidgets();
 }
 
@@ -110,4 +112,6 @@ void uiDeviceUpdateVersion::CreateWidgets()
 
     SetSizer(main_sizer);
     Layout();
+
+    wxGetApp().UpdateDarkUIWin(this);
 }