feat: add Open in New Tab button for PDF preview to bypass sandboxed iframe blocks

feat: add PDF preview-before-download with full-screen iframe overlay

fix: restrict JSON Response card height and truncate giant base64 strings to prevent screen blowouts

feat: 50-50 layout split, immediate upload preview, and connected session-level telemetry logs

feat: implement interactive docs switcher, scroll locking refinements, and rebuild asset bundle

feat: upgrade developer playground dashboard to premium clinical design with vite and typescript