feat: Added asynchronous algorithm apply

[AdamMytnik]

Non-Blocking Image Processing with Live Progress Updates

Issue Fixed

Closes #16: Make rust calls asynchronous

Problem

Previously, applying multiple image processing algorithms would block the UI thread, causing the application to become unresponsive during processing. This was due to synchronous WASM function calls running consecutively without yielding control back to the main thread.

Implementation

Backend Changes

• Individual WASM algorithm calls remain synchronous
• Processing loop is now asynchronous, allowing UI updates between algorithms
• Added yield points using setTimeout to prevent UI blocking

Frontend Improvements

• Added progress visualization:
  • Progress bar showing completion percentage
  • Current algorithm name display
  • Real-time preview updates after each algorithm
• Improved memory management with proper cleanup of image resources
• Disabled controls during processing to prevent concurrent operations

[Copilot]

Pull Request Overview

This PR converts the image processing loop to run asynchronously, adds live progress tracking in the UI, and ensures proper cleanup of created Blob URLs to avoid memory leaks.

• Introduce async handleRun with setTimeout yields to keep the UI responsive
• Add state and UI for progress bar, current algorithm label, and disable controls during processing
• Manage and revoke Blob URLs for both source and result images on updates and unmount