fix: TUI should use cwd from Config (#808)

https://github.com/openai/codex/pull/800 made `cwd` a property of
`Config`, so the TUI should use this instead of running
`std::env::current_dir()`.

codex-rs/tui/src/chatwidget.rs

@@ -1,3 +1,4 @@
+use std::path::PathBuf;
 use std::sync::mpsc::SendError;
 use std::sync::mpsc::Sender;
 use std::sync::Arc;
@@ -34,7 +35,6 @@ pub(crate) struct ChatWidget<'a> {
     bottom_pane: BottomPane<'a>,
     input_focus: InputFocus,
     config: Config,
-    cwd: std::path::PathBuf,
 }
 
 #[derive(Clone, Copy, Eq, PartialEq)]
@@ -48,15 +48,10 @@ impl ChatWidget<'_> {
         config: Config,
         app_event_tx: Sender<AppEvent>,
         initial_prompt: Option<String>,
-        initial_images: Vec<std::path::PathBuf>,
+        initial_images: Vec<PathBuf>,
     ) -> Self {
         let (codex_op_tx, mut codex_op_rx) = unbounded_channel::<Op>();
 
-        // Determine the current working directory up‑front so we can display
-        // it alongside the Session information when the session is
-        // initialised.
-        let cwd = std::env::current_dir().unwrap_or_else(|_| std::path::PathBuf::from("."));
-
         let app_event_tx_clone = app_event_tx.clone();
         // Create the Codex asynchronously so the UI loads as quickly as possible.
         let config_for_agent_loop = config.clone();
@@ -105,7 +100,6 @@ impl ChatWidget<'_> {
             }),
             input_focus: InputFocus::BottomPane,
             config,
-            cwd: cwd.clone(),
         };
 
         let _ = chat_widget.submit_welcome_message();
@@ -193,7 +187,7 @@ impl ChatWidget<'_> {
     fn submit_user_message_with_images(
         &mut self,
         text: String,
-        image_paths: Vec<std::path::PathBuf>,
+        image_paths: Vec<PathBuf>,
     ) -> std::result::Result<(), SendError<AppEvent>> {
         let mut items: Vec<InputItem> = Vec::new();
 
@@ -233,7 +227,7 @@ impl ChatWidget<'_> {
             EventMsg::SessionConfigured { model } => {
                 // Record session information at the top of the conversation.
                 self.conversation_history
-                    .add_session_info(&self.config, model, self.cwd.clone());
+                    .add_session_info(&self.config, model);
                 self.request_redraw()?;
             }
             EventMsg::AgentMessage { message } => {

codex-rs/tui/src/conversation_history_widget.rs

@@ -184,8 +184,8 @@ impl ConversationHistoryWidget {
 
     /// Note `model` could differ from `config.model` if the agent decided to
     /// use a different model than the one requested by the user.
-    pub fn add_session_info(&mut self, config: &Config, model: String, cwd: PathBuf) {
+    pub fn add_session_info(&mut self, config: &Config, model: String) {
-        self.add_to_history(HistoryCell::new_session_info(config, model, cwd));
+        self.add_to_history(HistoryCell::new_session_info(config, model));
     }
 
     pub fn add_active_exec_command(&mut self, call_id: String, command: Vec<String>) {

codex-rs/tui/src/history_cell.rs

@@ -144,18 +144,14 @@ impl HistoryCell {
         HistoryCell::BackgroundEvent { lines }
     }
 
-    pub(crate) fn new_session_info(
+    pub(crate) fn new_session_info(config: &Config, model: String) -> Self {
-        config: &Config,
-        model: String,
-        cwd: std::path::PathBuf,
-    ) -> Self {
         let mut lines: Vec<Line<'static>> = Vec::new();
 
         lines.push(Line::from("codex session:".magenta().bold()));
         lines.push(Line::from(vec!["↳ model: ".bold(), model.into()]));
         lines.push(Line::from(vec![
             "↳ cwd: ".bold(),
-            cwd.display().to_string().into(),
+            config.cwd.display().to_string().into(),
         ]));
         lines.push(Line::from(vec![
             "↳ approval: ".bold(),