add mousemove parallax effect on landing page

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No files or tests are listed, so first locate the landing page entry (homepage component, route, or HTML/JS bundle) in the repository. Then inspect existing event handlers and layout/styling for that page to identify where a mousemove-driven parallax transform/animation should be added. Run the app locally and verify on the landing page that cursor movement produces the intended parallax motion without breaking existing layout behavior; done when the effect is visible and stable.

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