Issue fixed related to back top top button

[Hamza110376]

[Fixes #15231 ]

Add scrollToTop utility and implementation

Description

• Implemented reusable scrollToTop utility function in /libs
• Added smooth scroll behavior to back-to-top button
• Supports both window scrolling and target element approaches
• Includes TypeScript types and proper error handling

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have performed a self-review of my own code
• I have commented the utility function
• My changes generate no new warnings
• Existing unit tests pass

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