notifs: use empty color for auto

src/Compositor.cpp

@@ -2299,6 +2299,6 @@ void CCompositor::performUserChecks() {
     if (std::ranges::any_of(BAD_PORTALS, [&](const std::string& portal) { return std::filesystem::exists("/usr/share/xdg-desktop-portal/portals/" + portal + ".portal"); })) {
         // bad portal detected
         g_pHyprNotificationOverlay->addNotification("You have one or more incompatible xdg-desktop-portal impls installed. Please remove incompatible ones to avoid issues.",
-                                                    ICONS_COLORS[ICON_ERROR], 15000, ICON_ERROR);
+                                                    CColor(0), 15000, ICON_ERROR);
     }
 }

src/debug/HyprNotificationOverlay.cpp

@@ -40,7 +40,7 @@ void CHyprNotificationOverlay::addNotification(const std::string& text, const CC
     const auto PNOTIF = m_dNotifications.emplace_back(std::make_unique<SNotification>()).get();
 
     PNOTIF->text  = text;
-    PNOTIF->color = color;
+    PNOTIF->color = color == CColor(0) ? ICONS_COLORS[icon] : color;
     PNOTIF->started.reset();
     PNOTIF->timeMs = timeMs;
     PNOTIF->icon   = icon;

src/plugins/PluginAPI.hpp

@@ -222,7 +222,7 @@ namespace HyprlandAPI {
         data has to contain:
          - text: std::string or const char*
          - time: uint64_t
-         - color: CColor
+         - color: CColor -> CColor(0) will apply the default color for the notification icon
 
         data may contain:
          - icon: eIcons