feat: single app-server bootstrap in TUI (#16582)

Before this, the TUI was starting 2 app-server. One to check the login
status and one to actually start the session

This PR make only one app-server startup and defer the login check in
async, outside of the frame rendering path

---------

Co-authored-by: Codex <noreply@openai.com>

codex-rs/utils/image/src/lib.rs

@@ -20,7 +20,7 @@ pub const MAX_WIDTH: u32 = 2048;
 /// Maximum height used when resizing images before uploading.
 pub const MAX_HEIGHT: u32 = 768;
 
-pub(crate) mod error;
+pub mod error;
 
 pub use crate::error::ImageProcessingError;