Create a Content Approval Portal web application using React, Node.js, Express, Tailwind CSS, and PostgreSQL with Prisma ORM. Build a central asset management dashboard allowing marketing team creators to submit social media posts, blog article drafts, and graphic assets for formal review. Implement role-based access control for Creators, Reviewers, and external Clients. Build an interactive Content Review Workspace featuring a media preview viewer supporting visual pin comments directly over images, alongside contextual text feedback threads. Create approval action controls that update asset status (Changes Requested, Approved) and trigger automated Slack webhook notifications and formatted email alerts via SendGrid. Include an interactive Editorial Content Calendar view mapping out approved social media posts and articles by their target publication dates, supporting drag-and-drop schedule adjustments and deadline reminders. Add AWS S3 secure cloud storage integration to handle high-resolution image and video upload assets with automated thumbnail compression.