♾️ style: Infinite Scroll Nav and Sort Convos by Date/Usage (#1708)

* Style: Infinite Scroll and Group convos by date

* Style: Infinite Scroll and Group convos by date- Redesign NavBar

* Style: Infinite Scroll and Group convos by date- Redesign NavBar - Clean code

* Style: Infinite Scroll and Group convos by date- Redesign NavBar - Redesign NewChat Component

* Style: Infinite Scroll and Group convos by date- Redesign NavBar - Redesign NewChat Component

* Style: Infinite Scroll and Group convos by date- Redesign NavBar - Redesign NewChat Component

* Including OpenRouter and Mistral icon

* refactor(Conversations): cleanup use of utility functions and typing

* refactor(Nav/NewChat): use localStorage `lastConversationSetup` to determine the endpoint to use, as well as icons -> JSX components, remove use of `endpointSelected`

* refactor: remove use of `isFirstToday`

* refactor(Nav): remove use of `endpointSelected`, consolidate scrolling logic to its own hook `useNavScrolling`, remove use of recoil `conversation`

* refactor: Add spinner to bottom of list, throttle fetching, move query hooks to client workspace

* chore: sort by `updatedAt` field

* refactor: optimize conversation infinite query, use optimistic updates, add conversation helpers for managing pagination, remove unnecessary operations

* feat: gen_title route for generating the title for the conversation

* style(Convo): change hover bg-color

* refactor: memoize groupedConversations and return as array of tuples, correctly update convos pre/post message stream, only call genTitle if conversation is new, make `addConversation` dynamically either add/update depending if convo exists in pages already, reorganize type definitions

* style: rename Header NewChat Button -> HeaderNewChat, add NewChatIcon, closely match main Nav New Chat button to ChatGPT

* style(NewChat): add hover bg color

* style: cleanup comments, match ChatGPT nav styling, redesign search bar, make part of new chat sticky header, move Nav under same parent as outlet/mobilenav, remove legacy code, search only if searchQuery is not empty

* feat: add tests for conversation helpers and ensure no duplicate conversations are ever grouped

* style: hover bg-color

* feat: alt-click on convo item to open conversation in new tab

* chore: send error message when `gen_title` fails

---------

Co-authored-by: Walber Cardoso <walbercardoso@gmail.com>

client/src/hooks/Nav/index.ts

@@ -0,0 +1 @@
+export { default as useNavScrolling } from './useNavScrolling';

client/src/hooks/Nav/useNavScrolling.ts

@@ -0,0 +1,64 @@
+import throttle from 'lodash/throttle';
+import React, { useCallback, useEffect, useRef } from 'react';
+import type { FetchNextPageOptions, InfiniteQueryObserverResult } from '@tanstack/react-query';
+import type { ConversationListResponse } from 'librechat-data-provider';
+
+export default function useNavScrolling({
+  hasNextPage,
+  isFetchingNextPage,
+  setShowLoading,
+  fetchNextPage,
+}: {
+  hasNextPage?: boolean;
+  isFetchingNextPage: boolean;
+  setShowLoading: React.Dispatch<React.SetStateAction<boolean>>;
+  fetchNextPage: (
+    options?: FetchNextPageOptions | undefined,
+  ) => Promise<InfiniteQueryObserverResult<ConversationListResponse, unknown>>;
+}) {
+  const scrollPositionRef = useRef<number | null>(null);
+  const containerRef = useRef<HTMLDivElement | null>(null);
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const fetchNext = useCallback(
+    throttle(() => fetchNextPage(), 750, { leading: true }),
+    [fetchNextPage],
+  );
+
+  const handleScroll = useCallback(() => {
+    if (containerRef.current) {
+      const { scrollTop, clientHeight, scrollHeight } = containerRef.current;
+      const nearBottomOfList = scrollTop + clientHeight >= scrollHeight * 0.97;
+
+      if (nearBottomOfList && hasNextPage && !isFetchingNextPage) {
+        setShowLoading(true);
+        fetchNext();
+      } else {
+        setShowLoading(false);
+      }
+    }
+  }, [hasNextPage, isFetchingNextPage, fetchNext, setShowLoading]);
+
+  useEffect(() => {
+    const container = containerRef.current;
+    if (container) {
+      container.addEventListener('scroll', handleScroll);
+    }
+
+    return () => {
+      container?.removeEventListener('scroll', handleScroll);
+    };
+  }, [handleScroll, fetchNext]);
+
+  const moveToTop = useCallback(() => {
+    const container = containerRef.current;
+    if (container) {
+      scrollPositionRef.current = container.scrollTop;
+    }
+  }, [containerRef, scrollPositionRef]);
+
+  return {
+    containerRef,
+    moveToTop,
+  };
+}