feat: moved blockclasses into dedicated folder

World/Blocks/BlockClasses/AirBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class AirBlock : IBlock
+{
+    public ushort Id => 0;
+    public string Name => "Air";
+    public bool IsOpaque => false;
+    public bool IsSolid => false;
+    public TileCoord GetTextureTile(BlockFace face) => new(0, 0);
+}

World/Blocks/BlockClasses/CoalOreBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class CoalOreBlock : IBlock
+{
+    public ushort Id => 7;
+    public string Name => "Coal Ore";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(0, 0); // placeholder
+}

World/Blocks/BlockClasses/DiamondOreBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class DiamondOreBlock : IBlock
+{
+    public ushort Id => 10;
+    public string Name => "Diamond Ore";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(0, 0); // placeholder
+}

World/Blocks/BlockClasses/DirtBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class DirtBlock : IBlock
+{
+    public ushort Id => 2;
+    public string Name => "Dirt";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(0, 0);
+}

World/Blocks/BlockClasses/GoldOreBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class GoldOreBlock : IBlock
+{
+    public ushort Id => 9;
+    public string Name => "Gold Ore";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(0, 0); // placeholder
+}

World/Blocks/BlockClasses/GrassBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class GrassBlock : IBlock
+{
+    public ushort Id => 3;
+    public string Name => "Grass";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+
+    public TileCoord GetTextureTile(BlockFace face) => face switch
+    {
+        BlockFace.Top => new TileCoord(0, 1),    // grass top
+        BlockFace.Bottom => new TileCoord(0, 0), // dirt
+        _ => new TileCoord(1, 1)                 // grass side
+    };
+}

World/Blocks/BlockClasses/IronOreBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class IronOreBlock : IBlock
+{
+    public ushort Id => 8;
+    public string Name => "Iron Ore";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(0, 0); // placeholder
+}

World/Blocks/BlockClasses/SandBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public class SandBlock : IBlock
+{
+    public ushort Id => 4;
+    public string Name => "Sand";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(2, 1);
+}

World/Blocks/BlockClasses/SnowBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public class SnowBlock : IBlock
+{
+    public ushort Id => 5;
+    public string Name => "Snow Block";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+
+    public TileCoord GetTextureTile(BlockFace face) => face switch
+    {
+        BlockFace.Top => new TileCoord(2, 0),
+        BlockFace.Bottom => new TileCoord(0, 0),
+        _ => new TileCoord(3, 0)
+    };
+}

World/Blocks/BlockClasses/StoneBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public sealed class StoneBlock : IBlock
+{
+    public ushort Id => 1;
+    public string Name => "Stone";
+    public bool IsOpaque => true;
+    public bool IsSolid => true;
+    public TileCoord GetTextureTile(BlockFace face) => new(1, 0);
+}

World/Blocks/BlockClasses/WaterBlock.cs

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+namespace VoxelEngine.World.Blocks;
+
+public class WaterBlock : IBlock
+{
+    public ushort Id => 6;
+    public string Name => "Water";
+    public bool IsOpaque => true;
+    public bool IsSolid => false;
+    public TileCoord GetTextureTile(BlockFace face) => new(3, 1);
+}