Add Nouveau driver support for Catppuccin shaders (Iris / Sodium)

## Description
We would like to request native support for the Nouveau open‑source GPU driver in the Catppuccin shader packs used with Iris and Sodium. Currently the shaders work only with proprietary drivers (NVIDIA/AMD), which excludes a portion of the Linux community that relies on Nouveau.

## Expected behavior

Catppuccin shaders compile and run correctly when Minecraft is launched with Iris + Sodium on systems using the Nouveau driver.
No visual artifacts, crashes, or performance regressions should appear compared to the proprietary driver implementation.

## Actual behavior

Shader working with Texture Errors

## Steps to reproduce

Install **Minecraft** with the **Iris shader** mod and Sodium performance mod.
Install the Catppuccin shader pack (any variant).
Run the game on a Linux system using the Nouveau driver (e.g., a laptop with an NVIDIA GPU and the nouveau kernel module).
See **visual artifacts** and more...

Start by reproducing the texture errors with Minecraft, Iris, Sodium, the Catppuccin shader pack, and the Nouveau driver on Linux. Done means the shaders compile and run without visual artifacts, crashes, or performance regressions compared with the proprietary-driver implementation.

Written by the indexing model from the issue text.