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/graphics/effects/Starfield3D.cpp

@@ -0,0 +1,164 @@
+// Starfield3D.cpp - 3D Parallax Starfield Implementation
+#include "Starfield3D.h"
+#include <cmath>
+#include <algorithm>
+
+Starfield3D::Starfield3D() : rng(std::random_device{}()), width(800), height(600), centerX(400), centerY(300) {
+}
+
+void Starfield3D::init(int w, int h, int starCount) {
+    width = w;
+    height = h;
+    centerX = width * 0.5f;
+    centerY = height * 0.5f;
+    
+    stars.resize(starCount);
+    createStarfield();
+}
+
+void Starfield3D::resize(int w, int h) {
+    width = w;
+    height = h;
+    centerX = width * 0.5f;
+    centerY = height * 0.5f;
+}
+
+float Starfield3D::randomFloat(float min, float max) {
+    std::uniform_real_distribution<float> dist(min, max);
+    return dist(rng);
+}
+
+int Starfield3D::randomRange(int min, int max) {
+    std::uniform_int_distribution<int> dist(min, max - 1);
+    return dist(rng);
+}
+
+void Starfield3D::setRandomDirection(Star3D& star) {
+    star.targetVx = randomFloat(-MAX_VELOCITY, MAX_VELOCITY);
+    star.targetVy = randomFloat(-MAX_VELOCITY, MAX_VELOCITY);
+    
+    // Allow stars to move both toward and away from viewer
+    if (randomFloat(0.0f, 1.0f) < REVERSE_PROBABILITY) {
+        // Move away from viewer (positive Z)
+        star.targetVz = STAR_SPEED * randomFloat(0.5f, 1.0f);
+    } else {
+        // Move toward viewer (negative Z)
+        star.targetVz = -STAR_SPEED * randomFloat(0.7f, 1.3f);
+    }
+    
+    star.changing = true;
+    star.changeTimer = randomFloat(30.0f, 120.0f); // Direction change lasts 30-120 frames
+}
+
+void Starfield3D::updateStar(int index) {
+    Star3D& star = stars[index];
+    
+    star.x = randomFloat(-25.0f, 25.0f);
+    star.y = randomFloat(-25.0f, 25.0f);
+    star.z = randomFloat(1.0f, MAX_DEPTH);
+    
+    // Give stars initial velocities in all possible directions
+    if (randomFloat(0.0f, 1.0f) < 0.5f) {
+        // Half stars start moving toward viewer
+        star.vx = randomFloat(-0.1f, 0.1f);
+        star.vy = randomFloat(-0.1f, 0.1f);
+        star.vz = -STAR_SPEED * randomFloat(0.8f, 1.2f);
+    } else {
+        // Half stars start moving in random directions
+        star.vx = randomFloat(-0.2f, 0.2f);
+        star.vy = randomFloat(-0.2f, 0.2f);
+        
+        // 30% chance to start moving away
+        if (randomFloat(0.0f, 1.0f) < 0.3f) {
+            star.vz = STAR_SPEED * randomFloat(0.5f, 0.8f);
+        } else {
+            star.vz = -STAR_SPEED * randomFloat(0.8f, 1.2f);
+        }
+    }
+    
+    star.targetVx = star.vx;
+    star.targetVy = star.vy;
+    star.targetVz = star.vz;
+    star.changing = false;
+    star.changeTimer = 0.0f;
+    star.type = randomRange(0, COLOR_COUNT);
+    
+    // Give some stars initial direction variations
+    if (randomFloat(0.0f, 1.0f) < 0.4f) {
+        setRandomDirection(star);
+    }
+}
+
+void Starfield3D::createStarfield() {
+    for (size_t i = 0; i < stars.size(); ++i) {
+        updateStar(static_cast<int>(i));
+    }
+}
+
+void Starfield3D::update(float deltaTime) {
+    const float frameRate = 60.0f; // Target 60 FPS for consistency
+    const float frameMultiplier = deltaTime * frameRate;
+    
+    for (size_t i = 0; i < stars.size(); ++i) {
+        Star3D& star = stars[i];
+        
+        // Randomly change direction occasionally
+        if (!star.changing && randomFloat(0.0f, 1.0f) < DIRECTION_CHANGE_PROBABILITY * frameMultiplier) {
+            setRandomDirection(star);
+        }
+        
+        // Update velocities to approach target values
+        if (star.changing) {
+            // Smoothly transition to target velocities
+            const float change = VELOCITY_CHANGE * frameMultiplier;
+            star.vx += (star.targetVx - star.vx) * change;
+            star.vy += (star.targetVy - star.vy) * change;
+            star.vz += (star.targetVz - star.vz) * change;
+            
+            // Decrement change timer
+            star.changeTimer -= frameMultiplier;
+            if (star.changeTimer <= 0.0f) {
+                star.changing = false;
+            }
+        }
+        
+        // Update position using current velocity
+        star.x += star.vx * frameMultiplier;
+        star.y += star.vy * frameMultiplier;
+        star.z += star.vz * frameMultiplier;
+        
+        // Handle boundaries - reset star if it moves out of bounds, too close, or too far
+        if (star.z <= MIN_Z || 
+            star.z >= MAX_Z || 
+            std::abs(star.x) > 50.0f || 
+            std::abs(star.y) > 50.0f) {
+            updateStar(static_cast<int>(i));
+        }
+    }
+}
+
+void Starfield3D::drawStar(SDL_Renderer* renderer, float x, float y, int type) {
+    const SDL_Color& color = STAR_COLORS[type % COLOR_COUNT];
+    SDL_SetRenderDrawColor(renderer, color.r, color.g, color.b, color.a);
+    
+    // Draw star as a small rectangle (1x1 pixel)
+    SDL_FRect rect{x, y, 1.0f, 1.0f};
+    SDL_RenderFillRect(renderer, &rect);
+}
+
+void Starfield3D::draw(SDL_Renderer* renderer) {
+    for (const Star3D& star : stars) {
+        // Calculate perspective projection factor
+        const float k = DEPTH_FACTOR / star.z;
+        
+        // Calculate screen position with perspective
+        const float px = star.x * k + centerX;
+        const float py = star.y * k + centerY;
+        
+        // Only draw stars that are within the viewport
+        if (px >= 0.0f && px <= static_cast<float>(width) && 
+            py >= 0.0f && py <= static_cast<float>(height)) {
+            drawStar(renderer, px, py, star.type);
+        }
+    }
+}