Navbar AI chats followup (#18336)

Addresses review comments from
[PR#18161](https://github.com/twentyhq/twenty/pull/18161)

packages/twenty-front/src/modules/ui/navigation/navigation-drawer/components/NavigationDrawer.tsx

@@ -32,6 +32,7 @@ const StyledAnimatedContainer = styled.div<{
   isExpanded: boolean;
   isResizing: boolean;
 }>`
+  height: 100vh;
   max-height: 100vh;
   overflow: hidden;
   position: relative;

packages/twenty-front/src/modules/ui/navigation/navigation-drawer/components/NavigationDrawerHeader.tsx

@@ -13,7 +13,7 @@ import { useAtomStateValue } from '@/ui/utilities/state/jotai/hooks/useAtomState
 import { NavigationDrawerCollapseButton } from './NavigationDrawerCollapseButton';
 
 const StyledContainer = styled.div<{ isExpanded: boolean }>`
-  align-items: center;
+  align-items: ${({ isExpanded }) => (isExpanded ? 'center' : 'flex-start')};
   display: flex;
   flex-direction: ${({ isExpanded }) => (isExpanded ? 'row' : 'column')};
   gap: ${({ isExpanded }) => (isExpanded ? '0' : themeCssVariables.spacing[4])};
@@ -25,6 +25,7 @@ const StyledContainer = styled.div<{ isExpanded: boolean }>`
 
 const StyledRightActions = styled.div<{ isExpanded: boolean }>`
   align-items: center;
+  align-self: ${({ isExpanded }) => (isExpanded ? 'auto' : 'flex-end')};
   display: flex;
   flex-direction: ${({ isExpanded }) => (isExpanded ? 'row' : 'column')};
   gap: ${({ isExpanded }) => (isExpanded ? '0' : themeCssVariables.spacing[1])};
@@ -40,6 +41,13 @@ const StyledNavigationDrawerCollapseButton = styled(
   width: ${themeCssVariables.spacing[6]};
 `;
 
+const StyledWorkspaceDropdownContainer = styled.div`
+  min-height: ${themeCssVariables.spacing[8]};
+  display: flex;
+  align-items: center;
+  justify-content: center;
+`;
+
 type NavigationDrawerHeaderProps = {
   showCollapseButton: boolean;
 };
@@ -55,7 +63,9 @@ export const NavigationDrawerHeader = ({
 
   return (
     <StyledContainer isExpanded={isNavigationDrawerExpanded}>
-      <MultiWorkspaceDropdownButton />
+      <StyledWorkspaceDropdownContainer>
+        <MultiWorkspaceDropdownButton />
+      </StyledWorkspaceDropdownContainer>
       {!isMobile && (
         <StyledRightActions isExpanded={isNavigationDrawerExpanded}>
           <LightIconButton