tweak(playfield): rejilla violeta synthwave + brillos +5%; starfield unificat al color del títol

source/core/graphics/playfield.cpp

@@ -290,7 +290,9 @@ namespace Graphics {
                 static_cast<int>(START_Y),
                 static_cast<int>(END_X),
                 static_cast<int>(END_Y),
-                line.brightness);
+                line.brightness,
+                0.0F,
+                Defaults::Playfield::GRID_COLOR);
             // Cap brillant mentre creix.
             if (P < 1.0F) {
                 const float LENGTH = std::sqrt((DX * DX) + (DY * DY));
@@ -302,7 +304,9 @@ namespace Graphics {
                         static_cast<int>(START_Y + (DY * HEAD_T)),
                         static_cast<int>(END_X),
                         static_cast<int>(END_Y),
-                        Defaults::Playfield::HEAD_BRIGHTNESS);
+                        Defaults::Playfield::HEAD_BRIGHTNESS,
+                        0.0F,
+                        Defaults::Playfield::GRID_COLOR);
                 }
             }
             return;
@@ -329,7 +333,9 @@ namespace Graphics {
                 static_cast<int>(prev_y),
                 static_cast<int>(NX),
                 static_cast<int>(NY),
-                line.brightness);
+                line.brightness,
+                0.0F,
+                Defaults::Playfield::GRID_COLOR);
             prev_x = NX;
             prev_y = NY;
         }