style: aplicar fixes de clang-tidy (todo excepto uppercase-literal-suffix)

Corregidos ~2570 issues automáticamente con clang-tidy --fix-errors
más ajustes manuales posteriores:

- modernize: designated-initializers, trailing-return-type, use-auto,
  avoid-c-arrays (→ std::array<>), use-ranges, use-emplace,
  deprecated-headers, use-equals-default, pass-by-value,
  return-braced-init-list, use-default-member-init
- readability: math-missing-parentheses, implicit-bool-conversion,
  braces-around-statements, isolate-declaration, use-std-min-max,
  identifier-naming, else-after-return, redundant-casting,
  convert-member-functions-to-static, make-member-function-const,
  static-accessed-through-instance
- performance: avoid-endl, unnecessary-value-param, type-promotion,
  inefficient-vector-operation
- dead code: XOR_KEY (orphan tras eliminar encryptData/decryptData),
  dead stores en engine.cpp y png_shape.cpp
- NOLINT justificado en 10 funciones con alta complejidad cognitiva
  (initialize, render, main, processEvents, update×3, performDemoAction,
  randomizeOnDemoStart, renderDebugHUD, AppLogo::update)

Compilación: gcc -Wall sin warnings. clang-tidy: 0 issues.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

source/themes/dynamic_theme.hpp

@@ -1,8 +1,9 @@
 #pragma once
 
-#include "theme.hpp"
 #include <string>
 
+#include "theme.hpp"
+
 // Forward declaration (estructura definida en defines.h)
 struct DynamicThemeKeyframe;
 
@@ -30,10 +31,7 @@ class DynamicTheme : public Theme {
          * @param keyframes: Vector de keyframes (mínimo 2)
          * @param loop: ¿Volver al inicio al terminar? (siempre true en esta app)
          */
-        DynamicTheme(const char* name_en, const char* name_es,
-                     int text_r, int text_g, int text_b,
-                     std::vector<DynamicThemeKeyframe> keyframes,
-                     bool loop = true);
+        DynamicTheme(const char* name_en, const char* name_es, int text_r, int text_g, int text_b, std::vector<DynamicThemeKeyframe> keyframes, bool loop = true);
 
         ~DynamicTheme() override = default;
 
@@ -56,8 +54,12 @@ class DynamicTheme : public Theme {
 
         Color getBallColor(size_t ball_index, float progress) const override;
         void getBackgroundColors(float progress,
-                                 float& tr, float& tg, float& tb,
-                                 float& br, float& bg, float& bb) const override;
+            float& tr,
+            float& tg,
+            float& tb,
+            float& br,
+            float& bg,
+            float& bb) const override;
 
         // ========================================
         // ANIMACIÓN (soporte completo)
@@ -90,10 +92,10 @@ class DynamicTheme : public Theme {
         // ESTADO DE ANIMACIÓN
         // ========================================
 
-        size_t current_keyframe_index_ = 0;       // Keyframe actual
-        size_t target_keyframe_index_ = 1;        // Próximo keyframe
-        float transition_progress_ = 0.0f;        // Progreso 0.0-1.0 hacia target
-        bool paused_ = false;                     // Pausa manual con Shift+D
+        size_t current_keyframe_index_ = 0;  // Keyframe actual
+        size_t target_keyframe_index_ = 1;   // Próximo keyframe
+        float transition_progress_ = 0.0f;   // Progreso 0.0-1.0 hacia target
+        bool paused_ = false;                // Pausa manual con Shift+D
 
         // ========================================
         // UTILIDADES PRIVADAS