Summary

This PR significantly enhances the bounding box drawing tool by introducing interactive controls, improved visualization modes, and better user feedback. The changes modernize the UI/UX while maintaining backward compatibility.

Changes Made

• Replaced matplotlib-based rectangle rendering with OpenCV-powered image overlay techniques for more accurate and performant bbox drawing
• Added interactive button controls for line width adjustment (+/-), square mode toggle, and enlarged view toggle
• Implemented square mode (s key or button) to constrain bounding boxes to 1:1 aspect ratio during drawing and editing
• Added enlarged view mode (e key or button) that displays a zoomed inset of the selected region in the opposite corner
• Introduced dashed bounding box visualization during interaction, switching to solid lines for final output
• Refactored internal state management to track current_bbox as a simple tuple rather than managing multiple rectangle objects
• Improved figure sizing logic to dynamically scale based on number of images while capping maximum width
• Enhanced keypress and button press logging with consistent formatting
• Centralized image rendering logic in _generate_current_images() to ensure WYSIWYG behavior between preview and saved output
• Updated help messaging to reflect new controls and behaviors
• Removed legacy rectangle copying and matplotlib patch management code