Added a feature to use the full window width activated / deactivated via checkbox in the properties panel.

Core Functionality

Dynamic rectangle overlay that tracks mouse movement across web pages.
Configurable dimensions (width and height).
Customizable colors with an integrated visual picker.
Adjustable opacity control.
Vertical offset adjustment relative to mouse position.

Advanced Movement Controls
Smooth downward movement via Shift + Ctrl keyboard shortcut. Continuous animation when keys are held.
Automatic boundary detection to keep the rectangle within the viewport.
Resize the ruler using Ctrl + Alt + Arrow keys.

User Interface Features

Popup interface with intuitive controls, including:
Toggle button for activation and deactivation.
Interactive sliders for all adjustable parameters.
Real-time color selection with visual feedback.
Linked height/offset mode for synchronized adjustments.
Status panel displaying the current domain and activation state.

Persistence & Customization

Domain-specific configurations, allowing different settings per website.
Automatic saving via browser sync storage.
Persistent active/inactive state across browsing sessions.
Quick toggle using a dedicated keyboard shortcut (Ctrl + Shift + L).

General Bug fixes.