d240485d0e
Add GET /api/v1/messages/:id endpoint to retrieve quoted/replied messages for preview fill and navigation purposes. The endpoint includes authorization checks ensuring only conversation participants can access the message. Additionally improve file upload handling for native clients (expo-file-system) by accepting explicit displayName from frontend, with sanitization to prevent path traversal and 255-character length limit. File extension detection now prioritizes the real display name over the multipart header filename.