refactor: cleanup struct fields, resolve clippy lints, resolve/ignore svelte lints, checks error on warn

src/state.rs

@@ -20,14 +20,12 @@ pub struct AppState {
 #[derive(Debug)]
 pub enum ProxyError {
     Network(reqwest::Error),
-    Other(String),
 }
 
 impl std::fmt::Display for ProxyError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             ProxyError::Network(e) => write!(f, "Network error: {e}"),
-            ProxyError::Other(s) => write!(f, "{s}"),
         }
     }
 }