feat: implement interactive lesson management and update command handling

src/controller/command.rs

@@ -1,20 +1,13 @@
 //! Slash-command parser that maps TUI `/foo` input lines into `Command`
 //! variants for the action dispatch system.
 
-use crate::app::mode::ModeKind;
-
 /// A parsed slash command from the TUI input buffer.
 #[derive(Debug, Clone, PartialEq)]
 pub enum Command {
     Help,
     Quit,
-    LessonCreate(String),
-    LessonExport(String),
-    LessonImport(String),
-    LessonAccept(String),
-    LessonReject(String),
-    LessonList,
-    Mode(ModeKind),
+    LessonInteractive,
+    McpOpen,
     Clear,
     ClearConfirm,
     Login { provider: String },
@@ -54,31 +47,13 @@ pub fn parse_command(text: &str) -> Command {
         "/quit" => Command::Quit,
         "/clear" if arg1.is_empty() => Command::ClearConfirm,
         "/clear" => Command::Clear,
-        "/mode" if arg1.is_empty() => Command::Unknown("/mode requires a subcommand: chat, bash, help, settings".to_string()),
-        "/mode" => {
-            let mode = match arg1 {
-                "chat" | "c" => ModeKind::Chat,
-                "bash" | "b" => ModeKind::Bash,
-                "workflow" | "w" => ModeKind::Workflow,
-                "help" | "h" => ModeKind::Help,
-                "settings" | "s" => ModeKind::Settings,
-                _ => return Command::Unknown(format!("unknown mode: {}", arg1)),
-            };
-            Command::Mode(mode)
-        }
-        "/lesson" if arg1 == "export" && !arg2.is_empty() => Command::LessonExport(arg2.to_string()),
-        "/lesson" if arg1 == "import" && !arg2.is_empty() => Command::LessonImport(arg2.to_string()),
-        "/lesson" if arg1 == "list" || arg1 == "ls" => Command::LessonList,
-        "/lesson" if arg1 == "accept" && !arg2.is_empty() => Command::LessonAccept(arg2.to_string()),
-        "/lesson" if arg1 == "reject" && !arg2.is_empty() => Command::LessonReject(arg2.to_string()),
-        "/lesson" if !arg1.is_empty() => Command::LessonCreate(arg1.to_string()),
-        "/lesson" => Command::LessonList,
+        "/lesson" => Command::LessonInteractive,
         "/login" if arg1.is_empty() => Command::Login { provider: String::new() },
         "/login" if !arg1.is_empty() => Command::Login { provider: arg1.to_string() },
         "/edit" if !arg1.is_empty() => Command::Edit(arg1.to_string()),
         "/edit" => Command::Edit(".".to_string()),
         "/mcp" if arg1.is_empty() => {
-            Command::Mode(ModeKind::Mcp)
+            Command::McpOpen
         }
         "/mcp" if arg1 == "add" && !arg2.is_empty() => {
             let rest = arg2.trim();