feat: remove session hub and related commands from the application

src/controller/command.rs

@@ -4,16 +4,14 @@ use crate::app::mode::ModeKind;
 pub enum Command {
     Help,
     Quit,
-    Resume,
     LessonCreate(String),
     LessonExport(String),
     LessonImport(String),
     LessonAccept(String),
     LessonReject(String),
+    LessonList,
     Mode(ModeKind),
     Clear,
-    Save,
-    LessonList,
     Login { provider: String },
     Unknown(String),
 }
@@ -30,9 +28,7 @@ pub fn parse_command(text: &str) -> Command {
     match cmd {
         "/help" => Command::Help,
         "/quit" => Command::Quit,
-        "/resume" => Command::Resume,
         "/clear" => Command::Clear,
-        "/save" => Command::Save,
         "/mode" => {
             let mode = match arg1 {
                 "chat" | "c" => ModeKind::Chat,