feat: change new request keybind

[josbiz]

Description

Change the keybind for a new request from ctrl+b to ctrl+n.
Fixes #5073

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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[Copilot]

Pull Request Overview

This PR updates the keyboard shortcut for creating a new request from ctrl+b to ctrl+n (and command+b to command+n on Mac), aligning with more common conventions where 'n' typically represents 'new'.

• Changed the newRequest keybinding from ctrl/command+b to ctrl/command+n

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[josbiz]

Continuation of pr #5145