fix(UI): ensure that previous theme is fully invalidated when changing theme

chore(UI): update checked button border colour for retro theme

Author: AndyEveritt

libraries/lvgl

@@ -251,14 +251,11 @@ namespace UI::Themes
 		s_currentTheme = const_cast<Theme*>(this);
 
 		lv_enable_style_refresh(true);
-		lv_display_t* disp = lv_display_get_default();
-		lv_area_t full_area = {
-			0, 0, lv_display_get_horizontal_resolution(disp) - 1, lv_display_get_vertical_resolution(disp) - 1};
-		lv_inv_area(disp, &full_area);
 		{
 			ZoneScopedN("Refreshing styles");
-			lv_obj_refresh_style(lv_screen_active(), LV_PART_ANY, LV_STYLE_PROP_ANY);
+			lv_obj_report_style_change(NULL);
 		}
+		lv_obj_invalidate(lv_screen_active());
 	}
 
 	const LvglStyles& Theme::getLvglStyles() const

src/UI/Styles/Styles.cpp

@@ -63,6 +63,9 @@ namespace UI::Themes
 								   lv_style_set_shadow_color(lvgl.btn, colors.border);
 								   lv_style_set_shadow_opa(lvgl.btn, LV_OPA_COVER);
 
+								   lv_style_set_border_color(lvgl.btn_checked, colors.secondary);
+								   lv_style_set_border_width(lvgl.btn_checked, 3);
+
 								   /* Pressed: collapse shadow for "pushed" effect */
 								   lv_style_set_recolor(lvgl.pressed, lv_color_black());
 								   lv_style_set_recolor_opa(lvgl.pressed, 30);