Fix unused variables and clean up codebase

- Remove unused NextResponse imports from API routes
- Remove unused result variable in teams DELETE route
- Remove unused Link import from page.tsx
- Remove unused inspectTextSourceProperties function from obsClient.js
- Fix unused catch variables and response variables in test files
- Clean up all ESLint warnings for unused variables

app/page.tsx

@@ -1,7 +1,6 @@
 'use client';
 
 import { useState, useEffect, useMemo, useCallback } from 'react';
-import Link from 'next/link';
 import Dropdown from '@/components/Dropdown';
 import { useToast } from '@/lib/useToast';
 import { ToastContainer } from '@/components/Toast';