#844 add hover effects to Box\Box.style.js

[NikhilTigga]

Brief Title

Add Hover Effect to FileMessage Component

Acceptance Criteria fulfillment

• Added hover styles to the FileMessage component, enabling a subtle background color change when users hover over the component.
• Configured the hover effect to dynamically adapt to the current application theme (light or dark), ensuring a cohesive visual design across all modes.
• Verified that the hover effect does not interfere with existing functionalities of the FileMessage component, such as displaying file previews and metrics.

Fixes #844

Untitled2.mov

PR Test Details

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-<pr_number> after approval. Contributors are requested to replace <pr_number> with the actual PR number.

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[abirc8010]

Hey @NikhilTigga there is already an open PR on that issue.