fix(desktop): open external links in default browser

Intercept navigation events in the Tauri webview and open external
URLs (http/https) in the system's default browser instead of
navigating internally. This prevents users from getting stuck on
a "dead end" page when clicking links in AI-generated content.

Fixes anomalyco#6484

Author: athal7

packages/desktop/src-tauri/src/lib.rs

@@ -236,13 +236,32 @@ pub fn run() {
                 .unwrap_or(LogicalSize::new(1920, 1080));
 
             // Create window immediately with serverReady = false
+            let app_for_nav = app.clone();
             let mut window_builder =
                 WebviewWindow::builder(&app, "main", WebviewUrl::App("/".into()))
                     .title("OpenCode")
                     .inner_size(size.width as f64, size.height as f64)
                     .decorations(true)
                     .zoom_hotkeys_enabled(true)
                     .disable_drag_drop_handler()
+                    .on_navigation(move |url| {
+                        // Allow internal navigation (tauri:// scheme)
+                        if url.scheme() == "tauri" {
+                            return true;
+                        }
+                        // Allow localhost (the app's own server)
+                        if let Some(host) = url.host_str() {
+                            if host == "localhost" || host == "127.0.0.1" {
+                                return true;
+                            }
+                        }
+                        // Open external http/https URLs in default browser
+                        if url.scheme() == "http" || url.scheme() == "https" {
+                            let _ = app_for_nav.shell().open(url.as_str(), None);
+                            return false; // Cancel internal navigation
+                        }
+                        true
+                    })
                     .initialization_script(format!(
                         r#"
                       window.__OPENCODE__ ??= {{}};