Add a content editor for blog posts to my {{tech_stack}} site, so people who don't code can publish. The roles involved: {{user_roles}}. Read the existing code first and show me a short plan before changing files. Each post has a title, slug, excerpt, body, cover image with required alt text, author, category, a status of draft, scheduled or published, publish and updated dates, and an optional search title and description. The editor: - An admin area behind sign-in, where writers draft and editors or owners publish, enforced by database access rules - A rich text or Markdown editor, whichever suits the project, with autosave and a word count - Images resized on upload, with alt text required before saving - A private preview link showing the post exactly as it will look - Slugs generated from the title and editable; if a published slug changes, the old URL redirects - Scheduled posts go live on time without anyone pressing publish - Deleting archives a post instead of erasing it The public site: - Only published posts appear, including in the RSS feed and sitemap - Rendered content is sanitized so it can't run scripts Meet WCAG 2.2 AA in the editor too. When you're done, list the files changed, how to create the first editor account, and anything you assumed.