[Add] "Hot Files" visual indicators in the Explorer view

[LeonardLeroy]

Summary

Add visual cues (icons or colors) in the VS Code file explorer to help developers quickly identify which files have the highest carbon footprint.

Problem

In a project with dozens of files, it's difficult to know where to focus optimization efforts first without checking every single report in the dashboard.

Proposed solution

Integrate with the FileDecoration API to add badges or color-coding to filenames in the sidebar. For example, a file with a high carbon score could have a red icon or a specific "hot" badge.

Acceptance criteria

• Identify files with the highest energy impact during the scan.
• Apply FileDecoration (color or emblem) to those files in the sidebar.
• Ensure the decoration updates after each scan.

Additional context

This will help prioritize refactoring tasks for large-scale projects.