"Design a series of clean and professional icons for a Chrome Extension that enables users to create and use keyboard shortcuts for automating tasks on web pages. The icons should include stylized representations of a keyboard, a cogwheel for settings, and a lightning bolt for speed and automation. The design needs to be scalable, clear at small sizes (16x16, 48x48, and 128x128 pixels), and visually attractive in both color and monochrome. Prefer a modern and minimalist aesthetic, suitable for a tech-savvy audience. Include variations that emphasize simplicity and clarity at smaller sizes."