fix: stabilize multi-account chat handling

tests/vim_mode.rs

@@ -435,9 +435,9 @@ async fn test_ctrl_w_deletes_word_with_spaces() {
     assert_eq!(app.cursor_position, 9);
 }
 
-/// Ctrl+A → курсор в начало в Insert mode
+/// Home → курсор в начало в Insert mode
 #[tokio::test]
-async fn test_ctrl_a_moves_to_start_in_insert() {
+async fn test_home_moves_to_start_in_insert() {
     let mut app = TestAppBuilder::new()
         .with_chats(vec![create_test_chat("Chat", 101)])
         .selected_chat(101)
@@ -446,7 +446,7 @@ async fn test_ctrl_a_moves_to_start_in_insert() {
         .build();
     app.cursor_position = 11;
 
-    handle_main_input(&mut app, ctrl_key('a')).await;
+    handle_main_input(&mut app, key(KeyCode::Home)).await;
 
     assert_eq!(app.cursor_position, 0);
 }