fix: set DMABUF renderer fallback for Wayland + NVIDIA

[Dimillian]

Motivation

• Provide a built-in fallback to disable WebKit's DMABUF renderer on Wayland when an NVIDIA kernel driver is detected to avoid GBM/EGL initialization failures and crashes.

Description

• Add a detection in src-tauri/src/lib.rs that checks for a Wayland session via XDG_SESSION_TYPE or WAYLAND_DISPLAY and for NVIDIA via /proc/driver/nvidia/version, and sets WEBKIT_DISABLE_DMABUF_RENDERER=1 when appropriate and the variable is not already set.

Testing

• Ran npm run lint which completed successfully.
• Ran npm run typecheck (tsc --noEmit) which completed successfully.
• Ran cargo check in src-tauri which failed due to missing system glib-2.0 development package (glib-2.0.pc not found) in the environment.

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Codex Task

[Dimillian]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

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