🧭 refactor: Modernize Nav/Header (#7094)

* refactor: streamline model preset handling in conversation setup

* refactor: integrate navigation and location hooks in chat functions and event handlers, prevent cache from fetching on final event handling

* fix: prevent adding code interpreter non-image output to file list on message attachment event, fix all unhandled edge cases when this is done (treating the file download as an image attachment, undefined fields, message tokenCount issues, use of `startsWith` on undefined "text") although it is now prevent altogether

* chore: remove unused jailbreak prop from MinimalIcon component in EndpointIcon

* feat: add new SVG icons (MobileSidebar, Sidebar, XAIcon), fix: xAI styling in dark vs. light modes, adjust styling of Landing icons

* fix: open conversation in new tab on navigation with ctrl/meta key

* refactor: update Nav & Header to use close/open sidebar buttons, as well as redesign "New Chat"/"Bookmarks" buttons to the top of the Nav, matching the latest design of ChatGPT for simplicity and to free up space

* chore: remove unused isToggleHovering state and simplify opacity logic in Nav component

* style: match mobile nav to mobile header

client/src/components/Nav/NewChat.tsx

@@ -1,88 +1,27 @@
-import React, { useMemo, useCallback } from 'react';
-import { Search } from 'lucide-react';
+import React, { useCallback } from 'react';
 import { useRecoilValue } from 'recoil';
 import { useNavigate } from 'react-router-dom';
 import { useQueryClient } from '@tanstack/react-query';
 import { QueryKeys, Constants } from 'librechat-data-provider';
-import type { TConversation, TMessage } from 'librechat-data-provider';
-import { getEndpointField, getIconEndpoint, getIconKey } from '~/utils';
-import ConvoIconURL from '~/components/Endpoints/ConvoIconURL';
-import { useGetEndpointsQuery } from '~/data-provider';
+import type { TMessage, TStartupConfig } from 'librechat-data-provider';
+import { NewChatIcon, MobileSidebar, Sidebar } from '~/components/svg';
+import { getDefaultModelSpec, getModelSpecPreset } from '~/utils';
+import { TooltipAnchor, Button } from '~/components/ui';
 import { useLocalize, useNewConvo } from '~/hooks';
-import { icons } from '~/hooks/Endpoint/Icons';
-import { NewChatIcon } from '~/components/svg';
-import { cn } from '~/utils';
 import store from '~/store';
 
-const NewChatButtonIcon = React.memo(({ conversation }: { conversation: TConversation | null }) => {
-  const { data: endpointsConfig } = useGetEndpointsQuery();
-  const search = useRecoilValue(store.search);
-  const searchQuery = search.debouncedQuery;
-
-  const computedIcon = useMemo(() => {
-    if (searchQuery) {
-      return null;
-    }
-    let { endpoint = '' } = conversation ?? {};
-    const iconURL = conversation?.iconURL ?? '';
-    endpoint = getIconEndpoint({ endpointsConfig, iconURL, endpoint });
-    const endpointType = getEndpointField(endpointsConfig, endpoint, 'type');
-    const endpointIconURL = getEndpointField(endpointsConfig, endpoint, 'iconURL');
-    const iconKey = getIconKey({ endpoint, endpointsConfig, endpointType, endpointIconURL });
-    const Icon = icons[iconKey];
-    return { iconURL, endpoint, endpointType, endpointIconURL, Icon };
-  }, [searchQuery, conversation, endpointsConfig]);
-
-  if (searchQuery) {
-    return (
-      <div className="shadow-stroke relative flex h-7 w-7 items-center justify-center rounded-full bg-white text-black dark:bg-white">
-        <Search className="h-5 w-5" />
-      </div>
-    );
-  }
-
-  if (!computedIcon) {
-    return null;
-  }
-
-  const { iconURL, endpoint, endpointIconURL, Icon } = computedIcon;
-
-  return (
-    <div className="h-7 w-7 flex-shrink-0">
-      {iconURL && iconURL.includes('http') ? (
-        <ConvoIconURL
-          iconURL={iconURL}
-          modelLabel={conversation?.chatGptLabel ?? conversation?.modelLabel ?? ''}
-          endpointIconURL={iconURL}
-          context="nav"
-        />
-      ) : (
-        <div className="shadow-stroke relative flex h-full items-center justify-center rounded-full bg-white text-black">
-          {endpoint && Icon && (
-            <Icon
-              size={41}
-              context="nav"
-              className="h-2/3 w-2/3"
-              endpoint={endpoint}
-              iconURL={endpointIconURL}
-            />
-          )}
-        </div>
-      )}
-    </div>
-  );
-});
-
 export default function NewChat({
   index = 0,
   toggleNav,
   subHeaders,
   isSmallScreen,
+  headerButtons,
 }: {
   index?: number;
   toggleNav: () => void;
+  isSmallScreen?: boolean;
   subHeaders?: React.ReactNode;
-  isSmallScreen: boolean;
+  headerButtons?: React.ReactNode;
 }) {
   const queryClient = useQueryClient();
   /** Note: this component needs an explicit index passed if using more than one */
@@ -91,48 +30,64 @@ export default function NewChat({
   const localize = useLocalize();
   const { conversation } = store.useCreateConversationAtom(index);
 
-  const clickHandler = useCallback(
-    (event: React.MouseEvent<HTMLAnchorElement>) => {
-      if (event.button === 0 && !(event.ctrlKey || event.metaKey)) {
-        event.preventDefault();
-        queryClient.setQueryData<TMessage[]>(
-          [QueryKeys.messages, conversation?.conversationId ?? Constants.NEW_CONVO],
-          [],
-        );
-        newConvo();
-        navigate('/c/new');
+  const clickHandler: React.MouseEventHandler<HTMLButtonElement> = useCallback(
+    (e) => {
+      if (e.button === 0 && (e.ctrlKey || e.metaKey)) {
+        window.open('/c/new', '_blank');
+        return;
+      }
+      queryClient.setQueryData<TMessage[]>(
+        [QueryKeys.messages, conversation?.conversationId ?? Constants.NEW_CONVO],
+        [],
+      );
+      newConvo();
+      navigate('/c/new');
+      if (isSmallScreen) {
         toggleNav();
       }
     },
-    [queryClient, conversation, newConvo, navigate, toggleNav],
+    [queryClient, conversation, newConvo, navigate, toggleNav, isSmallScreen],
   );
 
   return (
-    <div className="sticky left-0 right-0 top-0 z-50 bg-surface-primary-alt pt-3.5">
-      <div className="pb-0.5 last:pb-0" style={{ transform: 'none' }}>
-        <a
-          href="/"
-          tabIndex={0}
-          data-testid="nav-new-chat-button"
-          onClick={clickHandler}
-          className={cn(
-            'group flex h-10 items-center gap-2 rounded-lg px-2 font-medium transition-colors duration-200 hover:bg-surface-hover',
-            isSmallScreen ? 'h-14' : '',
-          )}
-          aria-label={localize('com_ui_new_chat')}
-        >
-          <NewChatButtonIcon conversation={conversation} />
-          <div className="grow overflow-hidden text-ellipsis whitespace-nowrap text-sm text-text-primary">
-            {localize('com_ui_new_chat')}
-          </div>
-          <div className="flex gap-3">
-            <span className="flex items-center" data-state="closed">
-              <NewChatIcon className="size-5" />
-            </span>
-          </div>
-        </a>
+    <>
+      <div className="flex items-center justify-between py-[2px] md:py-2">
+        <TooltipAnchor
+          description={localize('com_nav_close_sidebar')}
+          render={
+            <Button
+              size="icon"
+              variant="outline"
+              data-testid="close-sidebar-button"
+              aria-label={localize('com_nav_close_sidebar')}
+              className="rounded-full border-none bg-transparent p-2 hover:bg-surface-hover md:rounded-xl"
+              onClick={toggleNav}
+            >
+              <Sidebar className="max-md:hidden" />
+              <MobileSidebar className="m-1 inline-flex size-10 items-center justify-center md:hidden" />
+            </Button>
+          }
+        />
+        <div className="flex">
+          {headerButtons}
+          <TooltipAnchor
+            description={localize('com_ui_new_chat')}
+            render={
+              <Button
+                size="icon"
+                variant="outline"
+                data-testid="nav-new-chat-button"
+                aria-label={localize('com_ui_new_chat')}
+                className="rounded-full border-none bg-transparent p-2 hover:bg-surface-hover md:rounded-xl"
+                onClick={clickHandler}
+              >
+                <NewChatIcon className="icon-md md:h-6 md:w-6" />
+              </Button>
+            }
+          />
+        </div>
       </div>
       {subHeaders != null ? subHeaders : null}
-    </div>
+    </>
   );
 }