Fix util_mac.mm: explicit cast void* -> NSView* for ARM64

cef_window_handle_t changed from a #define alias to typedef void*,
making the implicit void* -> NSView* conversion a compile error.
Use the CAST_CEF_WINDOW_HANDLE_TO_NSVIEW macro (ARC-aware).

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

Author: linesight

src/client_handler/util_mac.mm

@@ -85,7 +85,7 @@ void MacShutdown() {
 }
 
 void MacSetWindowTitle(CefRefPtr<CefBrowser> browser, char* title) {
-    NSView* view = browser->GetHost()->GetWindowHandle();
+    NSView* view = CAST_CEF_WINDOW_HANDLE_TO_NSVIEW(browser->GetHost()->GetWindowHandle());
     NSString* nstitle = [NSString stringWithFormat:@"%s" , title];
     view.window.title = nstitle;
 }