fix(linux): disable WebKitGTK hardware acceleration to prevent white screen (#986)

On some Linux systems with AMD GPUs (e.g., AMD Cezanne/Radeon Vega),
WebKitGTK's GPU process fails to initialize EGL, causing the app to
show a white screen on startup.

Root cause: `amdgpu_query_info(ACCEL_WORKING)` returns EACCES (-13),
which causes EGL display creation to fail with EGL_BAD_PARAMETER,
crashing the GPU process.

Fix: Use WebKitGTK's `set_hardware_acceleration_policy(Never)` API to
disable GPU acceleration on Linux, falling back to software rendering.
This is applied at startup via Tauri's `with_webview` API.

Co-authored-by: Naozhong AI <oursnoah@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/Cargo.lock

@@ -746,6 +746,7 @@ dependencies = [
  "tower-http 0.5.2",
  "url",
  "uuid",
+ "webkit2gtk",
  "winreg 0.52.0",
  "zip 2.4.2",
 ]

src-tauri/Cargo.toml

@@ -65,6 +65,9 @@ uuid = { version = "1.11", features = ["v4"] }
 [target.'cfg(any(target_os = "macos", target_os = "windows", target_os = "linux"))'.dependencies]
 tauri-plugin-single-instance = "2"
 
+[target.'cfg(target_os = "linux")'.dependencies]
+webkit2gtk = { version = "2.0.1", features = ["v2_16"] }
+
 [target.'cfg(target_os = "windows")'.dependencies]
 winreg = "0.52"
 

src-tauri/src/lib.rs

@@ -768,6 +768,21 @@ pub fn run() {
                 restore_proxy_state_on_startup(&state).await;
             });
 
+            // Linux: 禁用 WebKitGTK 硬件加速，防止 EGL 初始化失败导致白屏
+            #[cfg(target_os = "linux")]
+            {
+                if let Some(window) = app.get_webview_window("main") {
+                    let _ = window.with_webview(|webview| {
+                        use webkit2gtk::{WebViewExt, SettingsExt, HardwareAccelerationPolicy};
+                        let wk_webview = webview.inner();
+                        if let Some(settings) = WebViewExt::settings(&wk_webview) {
+                            SettingsExt::set_hardware_acceleration_policy(&settings, HardwareAccelerationPolicy::Never);
+                            log::info!("已禁用 WebKitGTK 硬件加速");
+                        }
+                    });
+                }
+            }
+
             // 静默启动：根据设置决定是否显示主窗口
             let settings = crate::settings::get_settings();
             if let Some(window) = app.get_webview_window("main") {