make scrollbar thicker by default

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

or make an «add scrollbar width setting»

<img width="1919" height="1009" alt="Image" src="https://github.com/user-attachments/assets/51138555-af23-417c-b202-54c51e21d159" />

Proposed Solution

make it thicker at least

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_