Davidasix/protected pages are protected

[DavidASix]

Shuffled around some logic to ensure that protected routes are protected and not protected routes are not. Also simplified the routing implementation

[Copilot]

Pull Request Overview

This PR refactors routing logic to ensure that protected pages are accessible only to authenticated users while public pages remain open, and it simplifies the routing implementation.

• Introduces a new QueryProvider for handling React Query configuration and error reporting.
• Removes the standalone page.tsx and adjusts site and product layouts to enforce route protection.
• Moves authentication checks into layout components, redirecting users as appropriate.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/lib/tan-stack/query-provider.tsx	Adds a QueryProvider wrapper with error handling via toast.
src/app/page.tsx	Removes the redundant landing page with authentication logic.
src/app/(site)/page.tsx	Replaces explicit SiteLayout wrapper with a fragment to avoid duplicate layout rendering.
src/app/(site)/layout.tsx	Moves authentication check to the layout, redirecting authenticated users to the dashboard.
src/app/(product)/layout.tsx	Replaces client-side QueryClient logic with the new QueryProvider and adds a guard to redirect unauthenticated users to login.