fix : removed undefined mesh2 references in hero-canvas.js

[tmdeveloper007]

Summary of What Has Been Done

Removed references to undefined mesh2 variable in web-app/js/hero-canvas.js that caused JavaScript ReferenceErrors when changing theme or navigating away from the page.

File changed: web-app/js/hero-canvas.js

Changes Made

• Removed if (mesh2 && typeof mesh2.onThemeChange === 'function') mesh2.onThemeChange(); from theme change observer callback
• Removed if (mesh2 && typeof mesh2.destroy === 'function') mesh2.destroy(); from beforeunload handler
• Only mesh1 is created and used; mesh2 was never defined

Impact it Made

• Theme changes and page navigation no longer throw ReferenceErrors
• Cleaner JavaScript execution without console errors

Closes #1832

Note

Please assign this PR to the tmdeveloper007 account.

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