Add F2 keyboard shortcut for renaming requests

[AmirAliEidivandi]

Summary

Add an F2 keyboard shortcut to rename requests directly,
similar to how file renaming works in most file explorers and IDEs.

Problem

Currently, renaming a request requires right-clicking and selecting
"Rename" from the context menu. This is slow and mouse-dependent,
especially when working with many requests.

Proposed Solution

Add F2 as a keyboard shortcut to trigger the rename action on the
currently selected/focused request — consistent with the existing
shortcut pattern already visible in the context menu (e.g.,
Ctrl+Shift+G for Generate Code, Ctrl+D for Duplicate, etc.).

Why F2?

F2 is the universal standard for renaming in:

• Windows File Explorer
• VS Code (rename symbol)
• JetBrains IDEs
• Most file managers on Linux/macOS

It would feel immediately intuitive to most developers.

Additional Context

The context menu already shows keyboard shortcuts for most actions,
but Rename has no shortcut assigned. F2 is the natural fit.