feat: remove session hub and related commands from the application

src/app/mode/help.rs

@@ -9,7 +9,6 @@ Keybindings:
   Ctrl+P    Settings
   Ctrl+A    Toggle yolo arm
   Ctrl+B    Bash panel
-  Ctrl+S    Session hub
   Ctrl+T    Todo panel
   Ctrl+W    Workflow panel
   Ctrl+K    Key input
@@ -21,14 +20,12 @@ Keybindings:
 Slash commands:
   /help             Show this help
   /quit             Quit session
-  /resume           Resume from overlay
   /mode <name>      Switch mode (chat, agents, bash, workflow)
   /lesson <text>    Create a lesson
   /lesson list      List lessons
   /lesson export    Export lessons
   /lesson import    Import lessons
-  /clear            Clear transcript
-  /save             Save session";
+  /clear            Clear transcript";
 
 pub fn handle_help_action(action: &Action) -> Action {
     match action {