Fix blank window on Wayland (Hyprland) — disable WebKit DMA-BUF renderer

Sets WEBKIT_DISABLE_DMABUF_RENDERER=1 on Linux before Tauri initialises.
Prevents EGL_BAD_PARAMETER crash in WebKit's GPU process on compositors
like Hyprland that don't expose the required EGL display extensions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src-tauri/src/main.rs

@@ -2,5 +2,10 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
 fn main() {
+    // Disable WebKit DMA-BUF renderer which causes blank windows on some
+    // Wayland compositors (Hyprland, etc.) due to EGL_BAD_PARAMETER errors.
+    #[cfg(target_os = "linux")]
+    std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
+
     wrystr_lib::run()
 }