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 {

src/app/mode/mod.rs

@@ -19,14 +19,10 @@ pub mod mcp;
 pub mod onboard;
 #[expect(dead_code)]
 pub mod onboard_provider;
-#[expect(dead_code)]
-pub mod picker;
 pub mod quit_confirm;
 #[expect(dead_code)]
 pub mod rewind;
 pub mod security;
-#[expect(dead_code)]
-pub mod session_hub;
 pub mod settings;
 pub mod todo;
 #[expect(dead_code)]
@@ -40,11 +36,9 @@ pub enum ModeKind {
     Workflow,
     Help,
     Settings,
-    SessionHub,
     QuitConfirm,
     Onboard,
     OnboardProvider,
-    Picker,
     KeyInput,
     Editor,
     Effort,
@@ -64,11 +58,9 @@ impl ModeKind {
             ModeKind::Workflow => "Workflow",
             ModeKind::Help => "Help",
             ModeKind::Settings => "Settings",
-            ModeKind::SessionHub => "SessionHub",
             ModeKind::QuitConfirm => "QuitConfirm",
             ModeKind::Onboard => "Onboard",
             ModeKind::OnboardProvider => "OnboardProvider",
-            ModeKind::Picker => "Picker",
             ModeKind::KeyInput => "KeyInput",
             ModeKind::Editor => "Editor",
             ModeKind::Effort => "Effort",