feat: remove ModePicker overlay and related commands; update mode handling and documentation

src/app/runtime/actions/mod.rs

@@ -30,7 +30,6 @@ pub enum Action {
     OpenOverlay(Overlay),
     CloseOverlay,
     ToggleYoloArm,
-    CycleAgentMode,
     SystemNote {
         kind: String,
         message: String,
@@ -242,13 +241,6 @@ pub fn apply_action(state: &mut AppStateRest, action: Action) {
             state.misc.yolo_armed = !state.misc.yolo_armed;
             state.dirty = true;
         }
-        Action::CycleAgentMode => {
-            let next = state.mode.cycle();
-            state.set_mode(next);
-            let toast = Toast::new(ToastKind::Info, format!("Mode: {}", state.mode.name()));
-            state.push_toast(toast);
-            state.dirty = true;
-        }
         Action::SystemNote { kind: _kind, message } => {
             let toast = crate::app::state::types::Toast::new(
                 crate::app::state::types::ToastKind::Info,