fix(windows): gate with_webview call to Windows only

with_webview is not available on Linux; break the builder chain and apply
it conditionally so the Linux build compiles without the wry feature flag.

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

src-tauri/src/lib.rs

@@ -63,16 +63,16 @@ pub fn run() {
             };
 
             let app_handle = app.handle().clone();
-            WebviewWindowBuilder::new(app, "main".to_string(), window_url)
+            let builder = WebviewWindowBuilder::new(app, "main".to_string(), window_url)
                 .title("Cinny")
                 .disable_drag_drop_handler()
                 .on_new_window(move |url, _features| {
                     let _ = app_handle.opener().open_url(url.as_str(), None::<&str>);
                     NewWindowResponse::Deny
-                })
+                });
-                .with_webview(|webview| {
+
             #[cfg(target_os = "windows")]
-                    {
+            let builder = builder.with_webview(|webview| {
                 use webview2_com::Microsoft::Web::WebView2::Win32::ICoreWebView2PermissionRequestedEventHandler;
                 use windows::core::EventRegistrationToken;
                 use win_permissions::PermissionHandler;
@@ -81,15 +81,13 @@ pub fn run() {
                 if let Ok(core) = unsafe { controller.CoreWebView2() } {
                     let handler: ICoreWebView2PermissionRequestedEventHandler =
                         PermissionHandler.into();
-                            // Register the handler; token is unused since we never unregister.
-                            // If this fails to compile, try: unsafe { core.add_PermissionRequested(&handler) }
                     let mut token = EventRegistrationToken(0);
                     let _ = unsafe { core.add_PermissionRequested(&handler, &mut token) };
                     std::mem::forget(handler);
                 }
-                    }
+            });
-                })
+
-                .build()?;
+            builder.build()?;
             Ok(())
         })
         .run(context)