style(scrollbar): universally style all scrollbars and prevent body/viewport double scrollbars in workspace view

feat(ui): hide navbar in workspace view and expand panels vertically

feat(ui): implement workspace section for deploying and viewing live agent investigations

feat(auth): implement Google OAuth and Email/Password authentication

style(frontend): make background video page-wide and fixed for unified single-page layout

wire up Navbar, Hero, and Capabilities inside App.jsx

initialize React Vite frontend project with Tailwind v4 setup