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/HMSPanel.cpp

@@ -30,6 +30,7 @@ HMSNotifyItem::HMSNotifyItem(const std::string& dev_id, wxWindow *parent, DevHMS
     auto main_sizer = new wxBoxSizer(wxVERTICAL);
 
     m_panel_hms = new wxPanel(this, wxID_ANY, wxDefaultPosition, HMS_NOTIFY_ITEM_SIZE, wxTAB_TRAVERSAL);
+    m_panel_hms->SetBackgroundColour(*wxWHITE);
     auto m_panel_sizer = new wxBoxSizer(wxVERTICAL);
 
     auto m_panel_sizer_inner = new wxBoxSizer(wxHORIZONTAL);
@@ -126,6 +127,8 @@ HMSNotifyItem::HMSNotifyItem(const std::string& dev_id, wxWindow *parent, DevHMS
             if (!m_url.empty()) wxLaunchDefaultBrowser(m_url);
         });
 #endif
+
+    wxGetApp().UpdateDarkUIWin(this);
 }
 HMSNotifyItem ::~HMSNotifyItem() {
     ;
@@ -166,6 +169,7 @@ HMSPanel::HMSPanel(wxWindow *parent, wxWindowID id, const wxPoint &pos, const wx
     auto m_main_sizer = new wxBoxSizer(wxVERTICAL);
 
     m_scrolledWindow = new wxScrolledWindow(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxVSCROLL);
+    m_scrolledWindow->SetBackgroundColour(*wxWHITE);
     m_scrolledWindow->SetScrollRate(5, 5);
 
     m_top_sizer = new wxBoxSizer(wxVERTICAL);
@@ -179,6 +183,8 @@ HMSPanel::HMSPanel(wxWindow *parent, wxWindowID id, const wxPoint &pos, const wx
     this->SetSizerAndFit(m_main_sizer);
 
     Layout();
+
+    wxGetApp().UpdateDarkUIWin(this);
 }
 
 HMSPanel::~HMSPanel() {