Refactor heatmap event handling to update x-axis labels for clarity and ensure heatmap is plotted after processing search group logic.

Enhance heatmap event handling by incorporating search group functionality, allowing users to specify a search group for improved similarity calculations and visualization in the heatmap.

Enhance comments in heatmap_event.js for clarity on functionality and processing steps, including text reordering for cluster visualization.

Refactor heatmap event handling by modularizing utility functions and improving code organization; update index.html to enhance user input sections.

Enhance heatmap event handling by ensuring all groups are displayed, including empty ones, and maintaining consistent order in the similarity matrix and cluster names.

Implement event handler functions for heatmap, K-Means, cluster plot, and naming events; refactor main.js to use these handlers.