Feature request: Allow customizing the Claude logo/icon in the CLI

Question

## Description

It would be great to have a configuration option (e.g., in `~/.claude/settings.json`) to customize or replace the Claude logo/icon displayed in the CLI with a custom character, emoji, or ASCII art.

## Use case

Personalization — users who spend a lot of time in the CLI may want to make it feel more like their own.

## Suggested approach

A setting like:

```json
{
  "icon": "🐦"
}
```

or even support for short ASCII art would be nice.