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

src/app/state/misc.rs

@@ -75,14 +75,6 @@ const COMMANDS: &[&str] = &[
     "/lesson import",
     "/lesson accept",
     "/lesson reject",
-    "/mode chat",
-    "/mode bash",
-    "/mode help",
-    "/mode settings",
-    "/mode effort",
-    "/mode mcp",
-    "/mode rewind",
-    "/mode editor",
     "/login",
     "/login zen",
     "/login openai",

src/app/state/rest.rs

@@ -68,7 +68,7 @@ impl AppStateRest {
             .map(|n| n.to_string_lossy().to_string())
             .unwrap_or_default();
         AppStateRest {
-            mode: AgentMode::Normal,
+            mode: AgentMode::Auto,
             settings,
             app_config,
             workspace_roots,

src/app/state/types.rs

@@ -87,7 +87,6 @@ pub enum Overlay {
     Loading,
     ModelSelector,
     ClearConfirm,
-    ModePicker,
     LoginPicker,
 }