Add expand/collapse prompt view in codex resume picker with ←/→ keys

What feature would you like to see?

Add expand/collapse prompt view in codex resume picker with ←/→ keys

Proposal:
In the picker, let Right (→) expand the full first user prompt for the selected session;
Left (←) collapses it.
Show the expanded prompt inline directly under the selected row as one or more wrapped lines.

Problem:
The resume picker shows only a truncated first user message for each session. When browsing sessions, there’s no way to inspect the full prompt without resuming the session first.

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Why:
Quickly previewing the actual prompt helps pick the right session without leaving the picker.