fix(linux): resolve WebKitGTK DMA-BUF rendering issue and preserve user .desktop customizations

- Set WEBKIT_DISABLE_DMABUF_RENDERER=1 at startup to fix blank screen on Debian 13.2 and Nvidia GPUs
- Only register deep-link handler on first run to avoid overwriting user customizations
- Use correct Tauri path API (app.path().data_dir()) instead of dirs::data_dir() to match plugin's actual .desktop file location

src-tauri/src/main.rs

@@ -2,5 +2,15 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
 fn main() {
+    // 在 Linux 上设置 WebKit 环境变量以解决 DMA-BUF 渲染问题
+    // 某些 Linux 系统（如 Debian 13.2、Nvidia GPU）上 WebKitGTK 的 DMA-BUF 渲染器可能导致白屏/黑屏
+    // 参考: https://github.com/tauri-apps/tauri/issues/9394
+    #[cfg(target_os = "linux")]
+    {
+        if std::env::var("WEBKIT_DISABLE_DMABUF_RENDERER").is_err() {
+            std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
+        }
+    }
+
     cc_switch_lib::run();
 }