feat(theme): add tool_output color to themes

- Added a `tool_output` color to the `Theme` struct.
- Updated all built-in themes to include the new color.
- Modified the TUI to use the `tool_output` color for rendering tool output.

crates/owlen-tui/src/chat_app.rs

@@ -353,7 +353,6 @@ impl ChatApp {
             ("open", "Alias for load"),
             ("o", "Alias for load"),
             ("sessions", "List saved sessions"),
-            ("ls", "Alias for sessions"),
             ("help", "Show help documentation"),
             ("h", "Alias for help"),
             ("model", "Select a model"),
@@ -363,6 +362,9 @@ impl ChatApp {
             ("theme", "Switch theme"),
             ("themes", "List available themes"),
             ("reload", "Reload configuration and themes"),
+            ("e", "Edit a file"),
+            ("edit", "Alias for edit"),
+            ("ls", "List directory contents"),
             ("privacy-enable", "Enable a privacy-sensitive tool"),
             ("privacy-disable", "Disable a privacy-sensitive tool"),
             ("privacy-clear", "Clear stored secure data"),
@@ -1385,7 +1387,7 @@ impl ChatApp {
                                         }
                                     }
                                 }
-                                "sessions" | "ls" => {
+                                "sessions" => {
                                     // List saved sessions
                                     match self.controller.list_saved_sessions().await {
                                         Ok(sessions) => {
@@ -1419,6 +1421,47 @@ impl ChatApp {
                                     self.controller.start_new_conversation(None, None);
                                     self.status = "Started new conversation".to_string();
                                 }
+                                "e" | "edit" => {
+                                    if let Some(path) = args.first() {
+                                        match self.controller.read_file(path).await {
+                                            Ok(content) => {
+                                                let message = format!(
+                                                    "The content of file `{}` is:\n```\n{}\n```",
+                                                    path, content
+                                                );
+                                                self.controller
+                                                    .conversation_mut()
+                                                    .push_user_message(message);
+                                                self.pending_llm_request = true;
+                                            }
+                                            Err(e) => {
+                                                self.error =
+                                                    Some(format!("Failed to read file: {}", e));
+                                            }
+                                        }
+                                    } else {
+                                        self.error = Some("Usage: :e <path>".to_string());
+                                    }
+                                }
+                                "ls" => {
+                                    let path = args.first().copied().unwrap_or(".");
+                                    match self.controller.list_dir(path).await {
+                                        Ok(entries) => {
+                                            let message = format!(
+                                                "Directory listing for `{}`:\n```\n{}\n```",
+                                                path,
+                                                entries.join("\n")
+                                            );
+                                            self.controller
+                                                .conversation_mut()
+                                                .push_user_message(message);
+                                        }
+                                        Err(e) => {
+                                            self.error =
+                                                Some(format!("Failed to list directory: {}", e));
+                                        }
+                                    }
+                                }
                                 "theme" => {
                                     if args.is_empty() {
                                         self.error = Some("Usage: :theme <name>".to_string());