fix: prevent authenticated users from accessing sign-in page and fix UI overflow

[leoisadev8]

Redirect logged-in users to home when accessing /auth/sign-in. Also add overflow-hidden to the container to prevent horizontal scroll caused by decorative gradient orbs.

Changes:

• Redirect authenticated users from sign-in page to home
• Fix horizontal overflow on auth page caused by decorative elements

🤖 Generated with Claude Code

[railway-app]

🚅 Deployed to the openchat-pr-549 environment in OpenChat

Service	Status	Web	Updated (UTC)
web	😴 Sleeping (View Logs)	Web	Jan 23, 2026 at 5:09 pm

[greptile-apps]

Greptile Summary

Added authentication redirect to prevent logged-in users from accessing the sign-in page, and fixed horizontal overflow caused by decorative gradient orbs.

Major Changes:

• Redirect logic checks isAuthenticated and loading states before navigating authenticated users to home
• Added overflow-hidden class to root container to prevent horizontal scroll from decorative elements
• Imported useNavigate and useAuth hooks from respective libraries

Analysis:
The authentication redirect follows standard React patterns with proper dependency tracking in the useEffect hook. The redirect only triggers after the loading state completes (!loading && isAuthenticated), preventing race conditions or premature redirects.

The overflow fix addresses a UI issue where gradient orbs positioned outside the viewport (-right-1/4, -left-1/4, etc.) were causing horizontal scroll. The overflow-hidden class on the root container appropriately clips these decorative elements.

Confidence Score: 4/5

• This PR is safe to merge with low risk
• The changes are well-implemented with proper React patterns. The authentication redirect logic correctly waits for loading to complete before checking authentication status, preventing race conditions. The overflow fix is a simple CSS addition that solves the described issue. No breaking changes or security concerns identified.
• No files require special attention

Important Files Changed

Filename	Overview
apps/web/src/routes/auth/sign-in.tsx	Added authentication redirect and overflow fix. Redirect logic is sound, overflow-hidden prevents horizontal scroll from decorative elements.

Sequence Diagram

sequenceDiagram
    participant User
    participant Browser
    participant SignInPage
    participant useAuth
    participant AuthClient
    participant Router

    User->>Browser: Access /auth/sign-in
    Browser->>SignInPage: Mount component
    SignInPage->>useAuth: Check auth state
    useAuth->>AuthClient: Fetch session
    
    alt Already authenticated
        AuthClient-->>useAuth: Valid session
        useAuth-->>SignInPage: isAuthenticated: true
        SignInPage->>Router: navigate to home
        Router-->>Browser: Redirect to /
    else Not authenticated
        AuthClient-->>useAuth: No session
        useAuth-->>SignInPage: isAuthenticated: false
        SignInPage-->>Browser: Render sign-in form
        User->>SignInPage: Click OAuth button
        SignInPage->>AuthClient: Trigger OAuth flow
        AuthClient-->>Browser: Redirect to provider
    end

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