Lint: rename de helpers file-static y constexpr locales

Tanda local de identifier-naming: ningún símbolo cross-file, todo
contenido en su propio TU. De paso traduce los catalán/spanish a inglés
allá donde aplica.

- shape_renderer.cpp: apply_3d_rotation → apply3dRotation, transform_point
  → transformPoint, perspective_factor → PERSPECTIVE_FACTOR (constexpr).
- debris_manager.cpp: transform_point → transformPoint (otro file-static
  con el mismo nombre, no comparte símbolo con shape_renderer).
- logo_scene.cpp: calcular_progress_letra → computeLetterProgress.
- vector_text.cpp: char_width/char_height → BASE_CHAR_WIDTH/BASE_CHAR_HEIGHT
  (el sufijo BASE_ evita el conflicto con la macro CHAR_WIDTH de Windows
  headers que clang-tidy detectó).
- floating_score_manager.cpp::draw: constexpr scale/spacing → SCALE/SPACING.
- game_scene.cpp::dibuixar_missatge_stage: escala_base/spacing →
  BASE_SCALE/SPACING (constexpr locales).
- game_scene.cpp::dibuixar_continue: constexpr spacing → SPACING.
- game_scene.cpp en stepGameOver: constexpr scale/spacing → SCALE/SPACING.
- ship_animator.cpp::actualizar_exiting: constexpr Vec2 punt_fuga →
  VANISHING_POINT.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

source/game/effects/debris_manager.cpp

@@ -16,7 +16,7 @@ namespace Effects {
 
 // Helper: transformar point con rotación, scale i traslación
 // (Copiat de shape_renderer.cpp:12-34)
-static auto transform_point(const Vec2& point, const Vec2& shape_centre, const Vec2& position, float angle, float scale) -> Vec2 {
+static auto transformPoint(const Vec2& point, const Vec2& shape_centre, const Vec2& position, float angle, float scale) -> Vec2 {
     // 1. Centrar el point respecte al centro de la shape
     float centered_x = point.x - shape_centre.x;
     float centered_y = point.y - shape_centre.y;
@@ -86,9 +86,9 @@ void DebrisManager::explode(const std::shared_ptr<Graphics::Shape>& shape,
         for (const auto& [local_p1, local_p2] : segments) {
             // 1. Transformar points locals → coordenades mundials
             Vec2 world_p1 =
-                transform_point(local_p1, shape_centre, centro, angle, scale);
+                transformPoint(local_p1, shape_centre, centro, angle, scale);
             Vec2 world_p2 =
-                transform_point(local_p2, shape_centre, centro, angle, scale);
+                transformPoint(local_p2, shape_centre, centro, angle, scale);
 
             // 2. Trobar slot lliure
             Debris* debris = findFreeSlot();