Implement pixel-level color picker with enhanced features

[Lortunate]

Description

This pull request introduces a pixel-level color picker tool with the following features:

• Zoom functionality for precision picking.
• Grid overlay for better alignment and visualization.
• Keyboard shortcuts to improve usability and efficiency.

[gemini-code-assist]

Summary of Changes

Hello @Lortunate, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the application's capture features by integrating a sophisticated pixel-level color picker. This new tool allows users to precisely select colors from the screen with visual aids like zoom and a grid, and offers convenient keyboard controls for copying colors in various formats, thereby improving the overall utility and user experience of the capture functionality.

Highlights

• Introduced Pixel-Level Color Picker: A new ColorPicker.qml component has been added, providing precise pixel-level color selection with a magnified view.
• Enhanced User Interaction: The color picker includes zoom functionality, a grid overlay for alignment, and keyboard shortcuts for efficient operation (copy color, cycle format, move cursor).
• Backend Integration for Color Picking: The Rust backend (screen_capture.rs) now exposes getPixelColor to retrieve pixel data and copyText for clipboard operations, supporting the new QML color picker.

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[gemini-code-assist]

Code Review

This pull request introduces a well-implemented color picker feature. The QML code for the UI is clean and provides a good user experience with features like zoom, a grid, and keyboard navigation. The Rust backend functions for getting pixel color and copying text to the clipboard are robust, with proper threading and error handling. I have a couple of suggestions to improve maintainability and readability in both the QML and Rust code, mainly around avoiding magic numbers and simplifying control flow.