Fix LFX 2026 build failure

[KatalKavya96]

Description

This PR fixes #7783

This PR fixes the production build failure on /programs/lfx/2026.

The build was failing during Gatsby static HTML generation with the following error:

WebpackError: Element type is invalid: expected a string (for built-in components)
or a class/function (for composite components) but got: undefined.

The issue was caused by ArrowUpwardIcon being imported from @sistent/sistent, but that icon export appears to be unavailable/undefined. As a result, Gatsby attempted to render an undefined component during the production build.

This PR removes the invalid icon import and replaces it with a simple arrow inside the existing back-to-top button, keeping the same functionality while avoiding the undefined component error.

Notes for Reviewers

Tested with:

npm run build

The production build now completes successfully:

success Building static HTML for pages - 1330/1330
info Done building

There are still existing [gatsby-plugin-image] Missing image prop warnings during the build, but they do not block the build and appear unrelated to this specific failure.

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[github-actions]

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