Support cursor blinking in TUI mode

Feature request

When Claude Code launches, the TUI takes over the terminal and the cursor stops blinking — even when the user's terminal emulator has cursor blinking enabled.

The emotional case

The year was 1984. The Macintosh arrived. Ghostbusters hit theaters. Tetris was born. The Detroit Tigers won the World Series. And Amstrad released the CPC 464 — a beautiful machine with a glorious, faithfully blinking cursor on a green phosphor screen, patiently awaiting your next line of BASIC.

That cursor blink wasn't just a visual affordance. It was a heartbeat. A little rhythmic promise that the machine was alive, listening, ready.

Fast forward to 2026. I open my terminal. The cursor blinks. All is well. My heart beats in sync with it. Then I type claude and... silence. The cursor freezes. The blinking stops. And honestly? It's like my heart stops too.

I've configured my terminal emulator to blink. It blinks beautifully — right up until Claude Code takes over and apparently decides blinking is not the vibe.

The ask

Could Claude Code either:

1. Respect the terminal's existing cursor blink setting, or
2. Offer a config option to enable cursor blinking in the TUI

And if you're feeling generous — and I mean truly inspired by the spirit of '84 — a square block cursor option would be the cherry on top. The Amstrad didn't have some timid little line or underscore. It had a bold, proud, solid square. A cursor with presence. A cursor that said "I am HERE and I am READY."

It would mean the world. Or at least it would mean 1984 again, and that was a pretty great year.

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