feat: 🎸 ensure chat briefs and folders UI and functionality including add, remove and redirect in visitor and free user

feat: 🎸 ensure chat briefs and folders UI and functionality including add, remove and redirect in visitor and free user
feat: 🎸 handle multiple formats and numbers of files upload
feat: 🎸 upload functionality and UI, bot action UI

[x] Use @ in import path
Naming convention verification: checked
Coding style verification: checked
new Library: 0
new Class / Component: 2
1. src/components/file_upload_modal/file_upload_modal.tsx
2. src/components/uploaded_file_item/uploaded_file_item.tsx
new loop: 8
1. src/components/chat_page_body/chat_page_body.tsx(110)
2. src/components/file_upload_modal/file_upload_modal.tsx(42, 53, 117)
3. src/contexts/chat_context.tsx(121, 122, 137, 143)
new recursive: 0
high risk: 0
new sql: 0

CAFECA-IO / FAITH