[FE-44] Set up protected route middleware

[mftee]

Overview

Once auth state exists (FE-43), pages like /dashboard or /documents need to redirect unauthenticated users to /login rather than rendering and failing on missing data.

Tech

Next.js middleware.ts at the app root, checking for a session cookie/token.

Acceptance Criteria

• Create middleware.ts matching protected route prefixes (/dashboard, /documents, /profile, /settings, /admin, /disputes)
• Unauthenticated requests to a protected route redirect to /login?redirect=<original-path>
• After successful login, the user is returned to the original requested path
• /admin/* routes additionally verify the user's role and redirect non-admins to /dashboard

[feyishola]

@feyishola has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello im Feyishola a software developer with over 5 years of experience. please i would love to handle this issue

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Congratulations, @feyishola! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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This issue has been completed by @feyishola as part of the Stellar Wave Program's 7th Wave 🥳

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