feat(lighting): mode additive amb color per emissor

source/game/entities/player.cpp

@@ -150,10 +150,23 @@ void Player::loadFrom(const std::string& yaml_path) {
 void Player::readLightBlock(const fkyaml::node& yaml) {
     light_radius = 0;
     light_flicker = false;
+    light_color_r = 255;
+    light_color_g = 255;
+    light_color_b = 255;
     if (!yaml.contains("light")) { return; }
     const auto& l = yaml["light"];
     if (l.contains("radius")) { light_radius = l["radius"].get_value<int>(); }
     if (l.contains("flicker")) { light_flicker = l["flicker"].get_value<bool>(); }
+    // `color: [r, g, b]` opcional, bytes 0..255. Si manca, blanc (sense
+    // tint) — comportament idèntic al mode subtractive de hui.
+    if (l.contains("color")) {
+        const auto& c = l["color"];
+        if (c.is_sequence() && c.size() == 3) {
+            light_color_r = static_cast<std::uint8_t>(std::clamp(c[0].get_value<int>(), 0, 255));
+            light_color_g = static_cast<std::uint8_t>(std::clamp(c[1].get_value<int>(), 0, 255));
+            light_color_b = static_cast<std::uint8_t>(std::clamp(c[2].get_value<int>(), 0, 255));
+        }
+    }
 }
 
 void Player::readCollisionBlock(const fkyaml::node& yaml, const std::string& yaml_path) {