Added grouped filing controls in the popup for easier scanning.

Added new SEC filing lookup categories:
- S-1 and S-3 registration statements
- 424B prospectus filings and FWP free writing prospectuses
- SC 13D and SC 13G beneficial ownership filings
- 13F-HR institutional holdings reports
- 20-F annual reports and 6-K current reports for foreign issuers

Included amended forms for the new categories where applicable.

Added insider filings lookup for SEC Forms 3, 4, and 5. Updated the popup, package metadata, and screenshot to include insider ownership filings.