imrpv: improve the logic behind keeping the conversations updated in the folder tab

[JabSYsEmb]

right now, the extension is dispatching an 'validate-db' event each time an access to indexeddb occurred which causes a recreation for the container holding all conversation... which isn't efficient and will result in slowness for users with thousands of conversations instead of that we need to have a store object being created at the startup which represents all conversations and have it updated according upon each access to the database...

the following code needs to be improved.
https://github.com/JabSYsEmb/nextGPT/blob/f9ecaddde85bada8c94e9beb0d1f4e9d42ab69e0/src/utils/utils.js#L108-L111