refactor: add type annotation on `as_ref` for upcoming tauri 2.8#2917

Legend-Master wants to merge 2 commits intotauri-apps:v2tauri-apps/plugins-workspace:v2from

Legend-Master:webview-window-as-ref-tauri-2.8Legend-Master/plugins-workspace:webview-window-as-ref-tauri-2.8Copy head branch name to clipboard