Add friendly device name to Brightness API

[wangfu91]

Introduces a friendly_device_name method to both async and blocking Brightness traits and implementations for Linux and Windows (On Linux, right now it just falls back to device_name). Example code updated to display the friendly device name instead of the technical device name, improving user-facing output.

This addresses #12

[Copilot]

Pull Request Overview

This PR adds a friendly_device_name method to the Brightness API to provide user-friendly device names alongside the existing technical device names. This improves the user experience when displaying device information.

• Adds friendly_device_name method to both async and blocking Brightness traits
• Implements the method for Linux (returns same as device name) and Windows (returns friendly name from system)
• Updates example code to use friendly names for better user-facing output

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/lib.rs	Adds friendly_device_name method to async Brightness trait and its implementation
src/blocking.rs	Adds friendly_device_name method to blocking Brightness trait and its implementation
src/windows.rs	Implements async friendly_device_name for Windows devices
src/blocking/windows.rs	Adds friendly_name field and implements blocking friendly_device_name for Windows
src/linux.rs	Implements async friendly_device_name for Linux devices (returns device name)
src/blocking/linux.rs	Implements blocking friendly_device_name for Linux devices (returns device name)
examples/set_brightness_blocking.rs	Updates example to display friendly device name
examples/set_brightness_async.rs	Updates example to display friendly device name
examples/list_displays_async.rs	Adds friendly name display to device listing

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[stephaneyfx]

Thank you!