fix terminal corruption that could happen when onboarding and update banner (#5269)

Instead of printing characters before booting the app, make the upgrade
banner a history cell so it's well-behaved.

<img width="771" height="586" alt="Screenshot 2025-10-16 at 4 20 51 PM"
src="https://github.com/user-attachments/assets/90629d47-2c3d-4970-a826-283795ab34e5"
/>

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Co-authored-by: Josh McKinney <joshka@openai.com>

codex-rs/tui/Cargo.toml

@@ -59,6 +59,7 @@ ratatui = { workspace = true, features = [
     "unstable-rendered-line-info",
     "unstable-widget-ref",
 ] }
+ratatui-macros = { workspace = true }
 regex-lite = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true, features = ["preserve_order"] }