[FEATURE] Bring back the winter theme

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

The winter theme is no longer available with the new version and there is no way to restore it. Winter is still here and I wish the theme stayed for longer.

<img width="139" height="103" alt="Image" src="https://github.com/user-attachments/assets/60ccd17f-fe37-40a1-bef6-12b84e800ca8" />

Proposed Solution

Add a configuration option to restore the winter theme.

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

Related https://github.com/anthropics/claude-code/issues/13755.