[Bug]: Change reaction button

[RishiAnand108]

Description

Update the current reaction button to match the intended product design and improve its visual appearance and interaction.

Changes Required

• Replace the current reaction button design with the updated design.
• Ensure the button clearly communicates the reaction action.
• Maintain the existing reaction functionality.
• Ensure the updated button works consistently across relevant pages and responsive layouts.

Acceptance Criteria

• Current reaction button is replaced with the new design.
• Existing reaction functionality is preserved.
• Active/inactive reaction states are clearly distinguishable.
• Button is responsive and consistent with the overall UI.

[linear-code]

THE-117