♻️(frontend) delegate scroll to side panel content

Allow more flexibility in side panel behavior. Some panels, such as the chat,
require specific scrolling functionality:
- Header and footer should remain fixed
- Only chat messages should be scrollable

This change enables customization of scroll behavior for different panel types,
improving component reusability.

src/frontend/src/features/rooms/livekit/components/SidePanel.tsx

@@ -58,7 +58,7 @@ const StyledSidePanel = ({
         <RiCloseLine />
       </Button>
     </Div>
-    <Div overflowY="scroll">{children}</Div>
+    {children}
   </Box>
 )