Refactor routing and page components to ensure the main content is displayed identically for both logged-in and logged-out users, removing conditional rendering based on authentication status in the main router and consolidating content display logic into a new `MainContent` component.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/InMLMqG
