Refactor event bindings to use .on() and optimize resize handler updates

[JuanReyesVazquez23]

Summary

Refactors event bindings in "jquery.selectareas.js" without changing the plugin's behavior.

Changes

• Replaced deprecated ".bind()" calls with ".on()".
• Replaced ".mousedown()" shorthand with ".on("mousedown", ...)".
• Replaced the global selector used to hide resize handlers with the existing "$resizeHandlers" collection to avoid unnecessary DOM lookups.
• Improved code consistency and readability.

Benefits

• Uses the modern jQuery event API.
• Avoids unnecessary global DOM queries.
• Makes the code easier to maintain while preserving existing functionality.

No functional changes were introduced.