This PR enhances the MoiPosterImproved project to better reflect how content appears on a buildDotMoi profile. It implements a tabs-based navigation system that matches the actual buildDotMoi interface, with support for:

1. A default "Posts" tab that shows all vals with moi.md files (not excluded from posts)
2. Custom tabs defined in moi.md frontmatter "tabs" field
3. An "Unposted" tab for vals without moi.md files
4. The original tabs for Code (Public), Unlisted, and Private still exist for convenience

• ProfilePreview.tsx: Completely redesigned to fetch and display moi information for all vals, with proper sorting by tier
  • Now displays custom tabs from moi.md files as defined in frontmatter
  • Supports tier-based sorting (no tier first, then lowest to highest)
  • Respects the "excludeFromPosts" setting from moi.md files
  • Added informative notices explaining what each tab displays

• moiProcessor.ts:

  • Added a dedicated parseMoiConfig function to extract configuration from moi.md files
  • Enhanced parsing to properly handle tier, tabs, and excludeFromPosts properties

• index.ts:

  • Updated API endpoints to include parsed moi.md configuration in responses
  • Added config parsing to both file fetching and creation/update endpoints

1. Dynamic Tab Generation: Tabs are populated from the "tabs" fields in moi.md files
2. Tier-Based Sorting: Vals are sorted by tier with no tier first, then lowest to highest
3. Exclusion Support: "excludeFromPosts" property allows vals to appear in custom tabs but not in the main Posts tab
4. Improved Preview: The interface better represents how content will appear on a buildDotMoi profile

1. Start the app and enter your Val Town API key
2. Notice the new tab interface showing "Posts" first, followed by any custom tabs found in your moi.md files, then "Unposted"
3. Edit a val's moi.md and add a custom tab using the "Tabs" field
4. Save and verify the new tab appears in the interface
5. Try setting different tier values to see how it affects sorting
6. Test the "Exclude from Posts" checkbox and verify it removes items from the Posts tab but keeps them in custom tabs

• The existing functionality for editing moi.md files remains unchanged - this PR only enhances the preview interface
• The MoiEditor component already supported the tabs, tier, and excludeFromPosts properties
• The generators.ts file already included support for these properties in the default moi.md generation

(Would include screenshots here in a real PR)