Feature: File sharing support in chat #56
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This pull request adds a file sharing feature to the chat application. Users can now attach and send files (such as images or documents) in their chat messages using a WhatsApp-style attachment icon. Uploaded files are stored on the server and shared as downloadable links in the chat window.
Key changes:
Backend: Added file upload endpoint using Multer and static serving of uploaded files.
Frontend: Added file input with attachment icon, file upload logic, and display of file links in chat.
Updated UI to match WhatsApp-style file sharing experience.