feat: implement textured line clear effects and refine UI alignment

- **Visual Effects**: Upgraded line clear particles to use the game's block texture instead of simple circles, matching the reference web game's aesthetic.
- **Particle Physics**: Tuned particle velocity, gravity, and fade rates for a more dynamic explosion effect.
- **Rendering Integration**: Updated [main.cpp](cci:7://file:///d:/Sites/Work/tetris/src/main.cpp:0:0-0:0) and `GameRenderer` to pass the block texture to the effect system and correctly trigger animations upon line completion.
- **Menu UI**: Fixed [MenuState](cci:1://file:///d:/Sites/Work/tetris/src/states/MenuState.cpp:19:0-19:55) layout calculations to use fixed logical dimensions (1200x1000), ensuring consistent centering and alignment of the logo, buttons, and settings icon across different window sizes.
- **Code Cleanup**: Refactored `PlayingState` to delegate effect triggering to the rendering layer where correct screen coordinates are available.

src/core/interfaces/IGameRules.h

@@ -0,0 +1,73 @@
+#pragma once
+
+/**
+ * @brief Abstract interface for game rules
+ * 
+ * Provides a common interface for different Tetris rule implementations,
+ * enabling different game modes and rule variations.
+ */
+class IGameRules {
+public:
+    virtual ~IGameRules() = default;
+    
+    /**
+     * @brief Calculate score for cleared lines
+     * @param linesCleared Number of lines cleared simultaneously
+     * @param level Current game level
+     * @return Score points to award
+     */
+    virtual int calculateScore(int linesCleared, int level) const = 0;
+    
+    /**
+     * @brief Get gravity speed for a given level
+     * @param level Game level
+     * @return Time in milliseconds for one gravity drop
+     */
+    virtual double getGravitySpeed(int level) const = 0;
+    
+    /**
+     * @brief Check if level should increase
+     * @param totalLines Total lines cleared so far
+     * @param currentLevel Current game level
+     * @return true if level should increase, false otherwise
+     */
+    virtual bool shouldLevelUp(int totalLines, int currentLevel) const = 0;
+    
+    /**
+     * @brief Calculate next level based on lines cleared
+     * @param totalLines Total lines cleared so far
+     * @param startLevel Starting level
+     * @return New level
+     */
+    virtual int calculateLevel(int totalLines, int startLevel) const = 0;
+    
+    /**
+     * @brief Get soft drop speed multiplier
+     * @return Multiplier for gravity when soft dropping
+     */
+    virtual double getSoftDropMultiplier() const = 0;
+    
+    /**
+     * @brief Get hard drop score per cell
+     * @return Points awarded per cell for hard drop
+     */
+    virtual int getHardDropScore() const = 0;
+    
+    /**
+     * @brief Get soft drop score per cell
+     * @return Points awarded per cell for soft drop
+     */
+    virtual int getSoftDropScore() const = 0;
+    
+    /**
+     * @brief Check if T-spins are enabled in this rule set
+     * @return true if T-spins are supported, false otherwise
+     */
+    virtual bool supportsTSpins() const = 0;
+    
+    /**
+     * @brief Check if hold feature is enabled in this rule set
+     * @return true if hold is supported, false otherwise
+     */
+    virtual bool supportsHold() const = 0;
+};