Fix all ESLint errors: remove unused imports, replace any types

- Remove ~60 unused imports and variables across 88 files
- Replace ~80 `any` type annotations with proper types (unknown,
  Record<string, unknown>, or specific types)
- Prefix unused callback args with underscore
- Fix unescaped JSX entities
- Lint now passes cleanly (0 errors, 2 intentional img warnings)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/documents/document-list.tsx

@@ -1,6 +1,5 @@
 'use client';
 
-import { useState } from 'react';
 import { useQueryClient } from '@tanstack/react-query';
 
 import { Badge } from '@/components/ui/badge';

src/components/documents/signing-progress.tsx

@@ -41,7 +41,7 @@ export function SigningProgress({ documentId, signers }: SigningProgressProps) {
 
   const sorted = [...signers].sort((a, b) => a.signingOrder - b.signingOrder);
 
-  const handleResend = async (signer: Signer) => {
+  const handleResend = async (_signer: Signer) => {
     try {
       await apiFetch(`/api/v1/documents/${documentId}/remind`, { method: 'POST' });
       queryClient.invalidateQueries({ queryKey: ['documents', documentId, 'signers'] });