ref(angularx-qrcode.component.ts): prevent qr regeneration on accessi…

[ali-toghiani]

fixes #279

ngOnchanges checks input changes and only regenerates the qr if inputs that effect QR generation has changed.

[Copilot]

Pull Request Overview

This PR optimizes the QR code regeneration process by implementing selective change detection in the ngOnChanges lifecycle hook. Instead of regenerating the QR code on every input change, it now only regenerates when inputs that actually affect the visual appearance change.

• Introduces selective change detection to prevent unnecessary QR code regeneration
• Separates visual changes from accessibility attribute updates for better performance
• Refactors accessibility attribute setting into a reusable method

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[ali-toghiani]

Hi @Cordobo, I’ve addressed the feedback from Copilot in the recent commits. Please let me know if there’s anything else needed to move this PR forward or if you’re waiting on additional reviews. Happy to assist with any further changes! Thanks for your time.