fix: remove unused imports and suppress dead code warning

- Remove unused leptos::logging, leptos::html, leptos::task::spawn_local from toast.rs
- Remove unused Torrent import from table.rs
- Add #[allow(dead_code)] to modal.rs for unused fields

frontend/src/components/toast.rs

@@ -1,7 +1,4 @@
 use leptos::prelude::*;
-use leptos::logging;
-use leptos::html;
-use leptos::task::spawn_local;
 use shared::NotificationLevel;
 
 // ============================================================================