docs: Update architecture for supabase

test: Add tests for auth workflow

tests/unit/auth-middleware.test.ts

@@ -0,0 +1,24 @@
+// @vitest-environment node
+import { describe, it, expect } from 'vitest'
+import { checkAuthRedirect } from '~/utils/auth'
+
+describe('checkAuthRedirect', () => {
+  it.each(['/', '/login', '/signup', '/auth/callback'])(
+    'returns null for unauthenticated user on public route: %s',
+    (path) => {
+      expect(checkAuthRedirect(null, path)).toBeNull()
+    }
+  )
+
+  it('returns "/" for unauthenticated user on protected route', () => {
+    expect(checkAuthRedirect(null, '/boats')).toBe('/')
+  })
+
+  it('returns null for authenticated user on protected route', () => {
+    expect(checkAuthRedirect({ id: 'user-123' }, '/boats')).toBeNull()
+  })
+
+  it('returns null for authenticated user on public route', () => {
+    expect(checkAuthRedirect({ id: 'user-123' }, '/')).toBeNull()
+  })
+})