[FEATURE] Strong visual cue about the window's state (running, prompt, idle), e.g. background color

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I often have many Claude terminals open, and it happens all the time that I miss when one of them asks me for input, as with many windows it's tricky to notice which window needs input. Similarly, where nothing is happening, it's tricky to know.

Proposed Solution

A strong visual cue depending on the Claude's state

• screen background color changed (printf '\e]11;#c02020\a')
• big fat colorful line on the screen, for example the lines around prompt

Ideally configurable, or preset, e.g. default (idle), red (waiting for used), blue (running)

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_