afegida logica de continues

fix: el text no centrava correctament en horitzontal

source/game/escenes/escena_joc.hpp

@@ -24,6 +24,13 @@
 #include "core/system/game_config.hpp"
 #include "core/types.hpp"
 
+// Game over state machine
+enum class EstatGameOver {
+    NONE,        // Normal gameplay
+    CONTINUE,    // Continue countdown screen (9→0)
+    GAME_OVER    // Final game over (returning to title)
+};
+
 // Classe principal del joc (escena)
 class EscenaJoc {
     public:
@@ -53,8 +60,11 @@ class EscenaJoc {
 
         // Lives and game over system
         std::array<int, 2> vides_per_jugador_;  // [0]=P1, [1]=P2
-        bool game_over_;                        // Game over state flag
-        float game_over_timer_;                 // Countdown timer for auto-return (seconds)
+        EstatGameOver estat_game_over_;         // Game over state machine (NONE, CONTINUE, GAME_OVER)
+        int continue_counter_;                  // Continue countdown (9→0)
+        float continue_tick_timer_;             // Timer for countdown tick (1.0s)
+        int continues_usados_;                  // Continues used this game (0-3 max)
+        float game_over_timer_;                 // Final GAME OVER timer before title screen
         // Punt punt_spawn_;                       // DEPRECATED: usar obtenir_punt_spawn(player_id)
         Punt punt_mort_;                            // Death position (for respawn, legacy)
         std::array<int, 2> puntuacio_per_jugador_;  // [0]=P1, [1]=P2
@@ -78,6 +88,12 @@ class EscenaJoc {
         void disparar_bala(uint8_t player_id);             // Shoot bullet from player
         Punt obtenir_punt_spawn(uint8_t player_id) const;  // Get spawn position for player
 
+        // [NEW] Continue & Join system
+        void unir_jugador(uint8_t player_id);              // Join inactive player mid-game
+        void processar_input_continue();                   // Handle input during continue screen
+        void actualitzar_continue(float delta_time);       // Update continue countdown
+        void dibuixar_continue();                          // Draw continue screen
+
         // [NEW] Stage system helpers
         void dibuixar_missatge_stage(const std::string& missatge);