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/app/(dashboard)/[portSlug]/documents/page.tsx

@@ -1,7 +1,6 @@
 'use client';
 
 import { useState } from 'react';
-import { useParams } from 'next/navigation';
 import { Grid, List, Upload } from 'lucide-react';
 import { useQueryClient } from '@tanstack/react-query';
 
@@ -19,13 +18,12 @@ import { apiFetch } from '@/lib/api/client';
 import type { FileRow } from '@/components/files/file-grid';
 
 export default function DocumentsPage() {
-  const params = useParams<{ portSlug: string }>();
   const queryClient = useQueryClient();
 
   const { viewMode, setViewMode, currentFolder, setCurrentFolder } = useFileBrowserStore();
   const [showUpload, setShowUpload] = useState(false);
   const [previewFile, setPreviewFile] = useState<FileRow | null>(null);
-  const [renameFile, setRenameFile] = useState<FileRow | null>(null);
+  const [, setRenameFile] = useState<FileRow | null>(null);
 
   const { data, isLoading } = usePaginatedQuery<FileRow & { storagePath: string }>({
     queryKey: ['files'],