Reduce LightCall memory usage by 50 bytes per call (#9333)

esphome/components/light/light_state.h

@@ -31,9 +31,7 @@ enum LightRestoreMode : uint8_t {
 struct LightStateRTCState {
   LightStateRTCState(ColorMode color_mode, bool state, float brightness, float color_brightness, float red, float green,
                      float blue, float white, float color_temp, float cold_white, float warm_white)
-      : color_mode(color_mode),
-        state(state),
-        brightness(brightness),
+      : brightness(brightness),
         color_brightness(color_brightness),
         red(red),
         green(green),
@@ -41,10 +39,12 @@ struct LightStateRTCState {
         white(white),
         color_temp(color_temp),
         cold_white(cold_white),
-        warm_white(warm_white) {}
+        warm_white(warm_white),
+        effect(0),
+        color_mode(color_mode),
+        state(state) {}
   LightStateRTCState() = default;
-  ColorMode color_mode{ColorMode::UNKNOWN};
-  bool state{false};
+  // Group 4-byte aligned members first
   float brightness{1.0f};
   float color_brightness{1.0f};
   float red{1.0f};
@@ -55,6 +55,9 @@ struct LightStateRTCState {
   float cold_white{1.0f};
   float warm_white{1.0f};
   uint32_t effect{0};
+  // Group smaller members at the end
+  ColorMode color_mode{ColorMode::UNKNOWN};
+  bool state{false};
 };
 
 /** This class represents the communication layer between the front-end MQTT layer and the
@@ -216,6 +219,8 @@ class LightState : public EntityBase, public Component {
   std::unique_ptr<LightTransformer> transformer_{nullptr};
   /// List of effects for this light.
   std::vector<LightEffect *> effects_;
+  /// Object used to store the persisted values of the light.
+  ESPPreferenceObject rtc_;
   /// Value for storing the index of the currently active effect. 0 if no effect is active
   uint32_t active_effect_index_{};
   /// Default transition length for all transitions in ms.
@@ -224,15 +229,11 @@ class LightState : public EntityBase, public Component {
   uint32_t flash_transition_length_{};
   /// Gamma correction factor for the light.
   float gamma_correct_{};
-
   /// Whether the light value should be written in the next cycle.
   bool next_write_{true};
   // for effects, true if a transformer (transition) is active.
   bool is_transformer_active_ = false;
 
-  /// Object used to store the persisted values of the light.
-  ESPPreferenceObject rtc_;
-
   /** Callback to call when new values for the frontend are available.
    *
    * "Remote values" are light color values that are reported to the frontend and have a lower