fix: Update compatibility with latest ComfyUI versions

[huchukato]

Summary

This PR updates ComfyUI-Selectors to be compatible with the latest ComfyUI versions, fixing JavaScript console errors that occurred after a year of no updates.

Issues Fixed

• ✅ Import Path Updates: Fixed relative import paths for new ComfyUI structure
• ✅ Deprecated API Methods: Replaced ctx.roundRect() with compatible Canvas API implementation
• ✅ Code Duplication: Removed duplicate dimension_selectors.js causing conflicts
• ✅ Event Handling: Optimized with MutationObserver and requestAnimationFrame
• ✅ Resource Management: Improved cleanup and memory management

Changes Made

• Updated all JavaScript import paths from ../../scripts/app.js to ../../../scripts/app.js
• Replaced deprecated ctx.roundRect() with arcTo() implementation
• Consolidated dimension selector files (removed duplicate)
• Replaced setTimeout with requestAnimationFrame for better performance
• Added MutationObserver for efficient value monitoring
• Reduced polling frequency from 1s to 2s as fallback
• Enhanced cleanup procedures for removed nodes

Testing

• ✅ No JavaScript console errors on load
• ✅ All nodes load correctly in comfyassets/ category
• ✅ Sampler Selector works with all available samplers
• ✅ Scheduler Selector shows all scheduler options
• ✅ Seed History tracking and UI functions properly
• ✅ Width/Height nodes with presets and swap functionality
• ✅ Workflow save/load compatibility maintained

Compatibility

• ComfyUI v0.3.0+
• Node.js v18+
• Modern browsers with ES6+ support

Breaking Changes

None - this is a compatibility fix only.

Additional

Added COMPATIBILITY_UPDATE.md with detailed documentation of all changes.