fix: make msg request buttons sticky

ts/components/SplitViewContainer.tsx

@@ -8,7 +8,8 @@ type SplitViewProps = {
 };
 
 const StyledSplitView = styled.div`
-  height: 100%;
+  max-height: 100%;
+  min-height: 0;
   display: flex;
   flex-direction: column;
 `;

ts/components/conversation/MessageRequestButtons.tsx

@@ -25,6 +25,7 @@ const MessageRequestContainer = styled.div`
   padding: var(--margins-lg);
   gap: var(--margins-lg);
   text-align: center;
+  background: var(--background-secondary-color);
 `;
 
 const ConversationBannerRow = styled.div`

ts/components/conversation/SessionConversation.tsx

@@ -277,10 +277,10 @@ export class SessionConversation extends Component<Props, State> {
                   }
                   disableTop={!this.props.hasOngoingCallWithFocusedConvo}
                 />
-                <ConversationMessageRequestButtons />
 
                 {isDraggingFile && <SessionFileDropzone />}
               </div>
+              <ConversationMessageRequestButtons />
 
               <CompositionBox
                 sendMessage={this.sendMessageFn}