Allow sorting of mention files suggestions

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

Hi, it would be great if the files in the suggestion items when typing @ are sorted (and customizable).

Now it's quite random and hard to find.

<img width="172" height="261" alt="Image" src="https://github.com/user-attachments/assets/cf50a83e-f2ba-496b-8505-398ea5e8a7b0" />

Proposed Solution

Sort files suggested in the @ suggestion menu.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_