feat: Implement the main game scene with manager initialization, comprehensive UI setup including a dynamic message bar, tile respawn logic, and core multiplayer integration.

assets/shaders/tilt_shader.gdshader

@@ -0,0 +1,21 @@
+shader_type canvas_item;
+
+// Photoshop-style corner offsets in pixels
+uniform vec2 top_left = vec2(0.0);
+uniform vec2 top_right = vec2(0.0);
+uniform vec2 bottom_left = vec2(0.0);
+uniform vec2 bottom_right = vec2(0.0);
+
+void vertex() {
+	// 1. Calculate UV based on the vertex position relative to size
+	vec2 size = 1.0 / TEXTURE_PIXEL_SIZE;
+	vec2 uv = VERTEX / size;
+	
+	// 2. Linear interpolation to find the offset for this specific vertex
+	// This maps the square to whatever quadrilateral you define
+	vec2 top_row = mix(top_left, top_right, uv.x);
+	vec2 bottom_row = mix(bottom_left, bottom_right, uv.x);
+	vec2 final_offset = mix(top_row, bottom_row, uv.y);
+	
+	VERTEX += final_offset;
+}