Fix scrollbars not showing for mac and some padding issues (#1917)

ui/desktop/src/components/sessions/SessionHistoryView.tsx

@@ -98,7 +98,7 @@ const SessionHistoryView: React.FC<SessionHistoryViewProps> = ({
   };
 
   return (
-    <div className="h-screen w-full">
+    <div className="h-screen w-full flex flex-col">
       <div className="relative flex items-center h-[36px] w-full bg-bgSubtle"></div>
 
       {/* Top Row - back, info, reopen thread (fixed) */}

ui/desktop/src/components/sessions/SessionViewComponents.tsx

@@ -77,7 +77,7 @@ export const SessionMessages: React.FC<SessionMessagesProps> = ({
   onRetry,
 }) => {
   return (
-    <ScrollArea className="h-[calc(100vh-120px)] w-full">
+    <ScrollArea className="h-full w-full">
       <div className="p-4">
         <div className="flex flex-col space-y-4">
           <div className="space-y-4 mb-6">