Usage Guide:

1. Enable the Plugin: Navigate to Project Settings > Plugins and enable Shader Previewer.
2. Select an Active Node: Select a node in your scene that is already using the shader you want to preview. This allows the plugin to copy your current uniform settings (like colors or textures).
3. Open the Shader: Open the .gdshader file in the Godot Shader Editor.
4. Debug a Line: Place your cursor on any line inside the fragment() function that assigns a value (e.g., float mask = ...;).
5. Observe Results: The Shader Preview dock will show the visual state of that variable at that exact point in the code execution.