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/ui/Font.h

@@ -0,0 +1,20 @@
+// Font.h - Font rendering abstraction with simple size cache
+#pragma once
+#include <SDL3_ttf/SDL_ttf.h>
+#include <string>
+#include <unordered_map>
+struct SDL_Renderer;
+
+class FontAtlas {
+public:
+    bool init(const std::string& path, int basePt);
+    void shutdown();
+    void draw(SDL_Renderer* r, float x, float y, const std::string& text, float scale, SDL_Color color);
+    // Measure rendered text size in pixels for a given scale
+    void measure(const std::string& text, float scale, int& outW, int& outH);
+private:
+    std::string fontPath;
+    int baseSize{24};
+    std::unordered_map<int, TTF_Font*> cache; // point size -> font*
+    TTF_Font* getSized(int ptSize);
+};