refactor(defaults): centralitza constants de bullet, ship, enemy, hud i notifier

source/core/defaults/notifier.hpp

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+// notifier.hpp - Configuració del cuadre de notificacions toast (System::Notifier)
+// © 2026 JailDesigner
+
+#pragma once
+
+#include <SDL3/SDL.h>
+
+namespace Defaults::Notifier {
+
+    // Geometria del cuadre en coordenades lògiques (1280×720).
+    constexpr float CANVAS_WIDTH = 1280.0F;
+    constexpr float MARGIN_TOP = 40.0F;
+    constexpr float PADDING_H = 16.0F;
+    constexpr float PADDING_V = 10.0F;
+    constexpr float BORDER_THICKNESS = 2.0F;
+    constexpr float TEXT_SCALE = 0.55F;
+    constexpr float TEXT_SPACING = 2.0F;
+    constexpr float BORDER_BRIGHTNESS = 1.0F;
+
+    // Cinemàtica del slide.
+    constexpr float SLIDE_DURATION_S = 0.30F;
+
+    // Presets per als atajos semàntics.
+    constexpr SDL_Color COLOR_INFO{.r = 80, .g = 230, .b = 255, .a = 255};
+    constexpr SDL_Color COLOR_WARN{.r = 255, .g = 180, .b = 40, .a = 255};
+    constexpr SDL_Color COLOR_EXIT{.r = 255, .g = 80, .b = 80, .a = 255};
+    constexpr float DURATION_INFO = 2.0F;
+    constexpr float DURATION_WARN = 3.0F;
+    constexpr float DURATION_EXIT = 3.0F;
+
+}  // namespace Defaults::Notifier