refactor: normalizar notificaciones a castellano, title case sin dos puntos

- Todo en castellano (Vinyeta→viñeta, Cromàtica→cromática, Complet→completo, Desactivat→desactivado, Boids→boids)
- Primera letra mayúscula, resto minúscula (MODO SANDBOX→Modo sandbox, etc.)
- Sin dos puntos separador (PostFX: X→PostFX X, Escalado: X→Escalado X, Sprite: X→Textura X)
- Separadores de miles en castellano (1,000→1.000 pelotas)
- Nombres de figura en minúscula via tolower (SPHERE→sphere → "Modo sphere")
- Ajuste valores PostFX por defecto (vignette 1.5→0.8, chroma 1.0→0.2)

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

source/gpu/gpu_pipeline.hpp

@@ -8,8 +8,8 @@
 // MSL binding: constant PostFXUniforms& u [[buffer(0)]]
 // ============================================================================
 struct PostFXUniforms {
-    float vignette_strength;   // 0 = none, 1.5 = default subtle
-    float chroma_strength;     // 0 = off, 1 = full chromatic aberration
+    float vignette_strength;   // 0 = none, 0.8 = default subtle
+    float chroma_strength;     // 0 = off, 0.2 = default chromatic aberration
     float scanline_strength;   // 0 = off, 1 = full scanlines
     float time;                // accumulated seconds (for future animations)
 };