[FEATURE] Colorize the done todo items with green foreground 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

<img width="573" height="141" alt="Image" src="https://github.com/user-attachments/assets/1b205a9c-05f4-4a41-817c-0a913409457a" />

Proposed Solution

Now the done items colored with gray and dim color, would better use green color

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_