Fix server and username pre-population on login page

- Save credentials to LocalStorage on successful login when remember checkboxes are checked
- Save credentials immediately when input values change and remember is enabled
- Fix closure ownership issues with checkbox state in submit handler
- Ensure remembered values persist and pre-populate correctly on subsequent visits
- Address issue where values weren't saved if checkboxes defaulted to checked state

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/src/components/login.rs

@@ -30,17 +30,31 @@ pub fn Login(props: &LoginProps) -> Html {
 
     let on_server_url_change = {
         let server_url = server_url.clone();
+        let remember_server = remember_server.clone();
         Callback::from(move |e: Event| {
             let target = e.target_unchecked_into::<HtmlInputElement>();
-            server_url.set(target.value());
+            let new_value = target.value();
+            server_url.set(new_value.clone());
+            
+            // Save to localStorage immediately if remember is checked
+            if *remember_server {
+                let _ = LocalStorage::set("remembered_server_url", new_value);
+            }
         })
     };
 
     let on_username_change = {
         let username = username.clone();
+        let remember_username = remember_username.clone();
         Callback::from(move |e: Event| {
             let target = e.target_unchecked_into::<HtmlInputElement>();
-            username.set(target.value());
+            let new_value = target.value();
+            username.set(new_value.clone());
+            
+            // Save to localStorage immediately if remember is checked
+            if *remember_username {
+                let _ = LocalStorage::set("remembered_username", new_value);
+            }
         })
     };
 
@@ -90,6 +104,8 @@ pub fn Login(props: &LoginProps) -> Html {
         let password = password.clone();
         let error_message = error_message.clone();
         let is_loading = is_loading.clone();
+        let remember_server = remember_server.clone();
+        let remember_username = remember_username.clone();
         let on_login = props.on_login.clone();
 
         Callback::from(move |e: SubmitEvent| {
@@ -100,6 +116,8 @@ pub fn Login(props: &LoginProps) -> Html {
             let password = (*password).clone();
             let error_message = error_message.clone();
             let is_loading = is_loading.clone();
+            let remember_server_value = *remember_server;
+            let remember_username_value = *remember_username;
             let on_login = on_login.clone();
 
             // Basic client-side validation
@@ -140,6 +158,14 @@ pub fn Login(props: &LoginProps) -> Html {
                             let _ = LocalStorage::set("user_preferences", &prefs_json);
                         }
 
+                        // Save server URL and username to LocalStorage if remember checkboxes are checked
+                        if remember_server_value {
+                            let _ = LocalStorage::set("remembered_server_url", server_url.clone());
+                        }
+                        if remember_username_value {
+                            let _ = LocalStorage::set("remembered_username", username.clone());
+                        }
+
                         is_loading.set(false);
                         on_login.emit(token);
                     }