Build a comprehensive Social Content Planner web application for content creators and marketing teams. The application must feature an interactive weekly and monthly calendar view displaying scheduled, published, and draft posts across multiple social channels. Include a rich post editor drawer allowing users to draft post copy, attach image or video assets from a media library, select target platforms, set publication timestamps, and organize posts using campaign tags and content pillar categories. Implement a visual post status pipeline allowing users to transition items through Idea, Draft, Under Review, Scheduled, and Published workflow states. Provide live platform-specific character counters, hashtag suggestion panels, and responsive grid layouts. Ensure robust local state persistence so draft edits are automatically saved, and include search and filtering options by target platform, publication status, and campaign tag. Additionally, construct a media management tab for organizing media assets with tag filters, and add export capabilities for downloading content schedules into CSV files.