feat: respect accent colors in more places in desktop

programs/include/gui/mtk/theme.hpp

@@ -7,6 +7,7 @@
 #pragma once
 
 #include "gui/gui.hpp"
+#include "gui/mtk/settings.hpp"
 
 namespace gui::mtk {
 
@@ -28,6 +29,16 @@ inline Color darken(Color c, uint8_t amount) {
     return mix(c, colors::BLACK, amount);
 }
 
+// Light selection/hover tint derived from the desktop accent. Returns the
+// canonical MENU_HOVER for the default blue accent so existing visuals are
+// preserved exactly; otherwise tints white with ~11% of the accent.
+inline Color accent_hover_tint(Color accent) {
+    if (accent.r == colors::ACCENT.r && accent.g == colors::ACCENT.g
+        && accent.b == colors::ACCENT.b)
+        return colors::MENU_HOVER;
+    return mix(colors::WHITE, accent, 28);
+}
+
 struct Theme {
     Color window_bg;
     Color surface;
@@ -69,7 +80,7 @@ struct Theme {
     int gap_lg;
 };
 
-inline Theme make_theme(Color accent = colors::ACCENT) {
+inline Theme make_theme(Color accent) {
     Theme theme {};
     theme.window_bg = colors::WINDOW_BG;
     theme.surface = Color::from_rgb(0xF5, 0xF5, 0xF5);
@@ -112,4 +123,11 @@ inline Theme make_theme(Color accent = colors::ACCENT) {
     return theme;
 }
 
+// Zero-arg overload pulls the accent from the desktop appearance settings, so
+// MTK widgets (buttons, menus, etc.) automatically pick up the user's chosen
+// accent without each caller having to plumb it through.
+inline Theme make_theme() {
+    return make_theme(load_system_accent());
+}
+
 } // namespace gui::mtk