Wrapper: createProgram and createShader can return error.

[hazeycode]

Adds some error handling to gl procs that directly return error values.

[Copilot]

Pull Request Overview

This PR enhances the OpenGL wrapper by adding explicit error handling to createProgram and createShader, turning them into error-returning functions when invalid handles are produced.

• Change return types of createProgram and createShader to error unions (!Program, !Shader).
• Introduce checks for invalid handles and return error.glCreateProgramFailed or error.glCreateShaderFailed.
• Convert the raw integer from the binding into the appropriate enum only on success.

Comments suppressed due to low confidence (2)

src/wrapper.zig:2583

• [nitpick] Using a quoted identifier can reduce readability; consider renaming the parameter to something like shader_type for clarity.

        pub fn createShader(@"type": ShaderType) !Shader {

src/wrapper.zig:2577

• There's no test coverage for the failure path when glCreateProgram returns an invalid handle; consider adding a unit test to verify this error is emitted correctly.

                return error.glCreateProgramFailed;

[hazeycode]

Folow-up fixes in response to Copilot nitpicks: 2138b1a