Root cause: NewProjectModal was rendered inside ProjectSelector (in header),
causing the fixed inset-0 container to be constrained by the dropdown DOM tree.
Changes:
- NewProjectModal.tsx: Use createPortal to render chat screen at document.body level
- SpecCreationChat.tsx: Change h-full to h-screen for explicit viewport height
- SpecCreationChat.tsx: Add min-h-0 to messages area for proper flexbox scrolling
This fixes the chat screen not displaying full-screen when creating a new project
with Claude.
338622b734