Mechanical Switch — Crinkem
Source: https://freesound.org/people/Crinkem/sounds/496328/
License: Creative Commons Zero (CC0 1.0 Universal)
License URL: https://creativecommons.org/publicdomain/zero/1.0/

The source page permits copying, modifying, distributing and performing this
sound, including commercial use, without requesting permission.

Public audio used: official HQ MP3 preview
https://cdn.freesound.org/previews/496/496328_3544425-hq.mp3

Local derivative: button-clack.mp3
Converted to mono 22.05 kHz, 64 kbps MP3; gentle 90 Hz high-pass and peak limiter.
The release gesture uses the same sample at a slightly higher playback rate.