[Feature Request] Display message queue count in Claude Code CLI

Problem
While Claude is busy, I can queue messages by typing and pressing Enter, but there's no indication of how many are waiting. After queuing a few, I lose track of what I've lined up and can't tell whether something got queued or dropped.

Proposed solution
Show a count of pending queued messages somewhere persistent — e.g. in the status line or next to the input box (3 queued). Ideally, also a way to view, edit and remove individual queued messages before they run (e.g. a shortcut that lists them).

Why it helps
Makes queuing predictable for longer sessions: you can see your backlog, catch accidental queues, and reorder/cancel before they execute.