💬 feat: Temporary Chats (#5493)

* feat: add expiredAt property to Conversation and Message models

Added `expiredAt` property to both Conversation and Message schemas.
Configured `expireAfterSeconds` index in MongoDB to automatically delete documents after a specified period.

* feat(data-provider): add isTemporary and expiredAt properties to support temporary chats

Added `isTemporary` property to TPayload and TSubmission for API calls for temporary chat.
Additionally, added `expiredAt` property to `tConversationSchema` to determine if a chat is temporary.

* feat: implement isTemporary state management

Add Recoil state for tracking temporary conversations, update event handlers to respect temporary chat status

* feat: add configuration to interfaceconfig to hide the temporary chat switch

* feat: add Temporary Chat UI with switch and modify related behaviors

- Added a Temporary Chat switch button at the end of dropdown lists in each model.
- Updated the form background color to black when Temporary Chat is enabled.
- Modified Navigation to exclude Temporary Chats from the chat list.

* fix: exclude Temporary Chats from search results

Updated the getConvosQueried query to ensure that Temporary Chats are not included in the search results.

* fix: hide bookmark button for Temporary Chats

Updated the UI to ensure that the bookmark button is not displayed when a chat is as Temporary Chat.

* chore: update isTemporary state management in ChatRoute

* chore: fix to pass the tests

client/src/components/Input/ModelSelect/TemporaryChat.tsx

@@ -0,0 +1,61 @@
+import { useMemo } from 'react';
+
+import { MessageCircleDashed } from 'lucide-react';
+import { useRecoilState, useRecoilValue } from 'recoil';
+import { useGetStartupConfig } from 'librechat-data-provider/react-query';
+import { Constants, getConfigDefaults } from 'librechat-data-provider';
+import temporaryStore from '~/store/temporary';
+import { Switch } from '~/components/ui';
+import { cn } from '~/utils';
+import store from '~/store';
+
+export const TemporaryChat = () => {
+  const { data: startupConfig } = useGetStartupConfig();
+  const defaultInterface = getConfigDefaults().interface;
+  const [isTemporary, setIsTemporary] = useRecoilState(temporaryStore.isTemporary);
+  const conversation = useRecoilValue(store.conversationByIndex(0)) || undefined;
+  const conversationId = conversation?.conversationId ?? '';
+  const interfaceConfig = useMemo(
+    () => startupConfig?.interface ?? defaultInterface,
+    [startupConfig],
+  );
+
+  if (!interfaceConfig.temporaryChat) {
+    return null;
+  }
+
+  const isActiveConvo = Boolean(
+    conversation &&
+      conversationId &&
+      conversationId !== Constants.NEW_CONVO &&
+      conversationId !== 'search',
+  );
+
+  const onClick = () => {
+    if (isActiveConvo) {
+      return;
+    }
+    setIsTemporary(!isTemporary);
+  };
+
+  return (
+    <div className="sticky bottom-0 border-t border-gray-200 bg-white px-6 py-4 dark:border-gray-700 dark:bg-gray-700">
+      <div className="flex items-center">
+        <div className={cn('flex flex-1 items-center gap-2', isActiveConvo && 'opacity-40')}>
+          <MessageCircleDashed className="icon-sm" />
+          <span className="text-sm text-gray-700 dark:text-gray-300">Temporary Chat</span>
+        </div>
+        <div className="ml-auto flex items-center">
+          <Switch
+            id="enableUserMsgMarkdown"
+            checked={isTemporary}
+            onCheckedChange={onClick}
+            disabled={isActiveConvo}
+            className="ml-4"
+            data-testid="enableUserMsgMarkdown"
+          />
+        </div>
+      </div>
+    </div>
+  );
+};