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]/expenses/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState } from 'react';
-import { useParams, useRouter } from 'next/navigation';
+import { useParams } from 'next/navigation';
 import { Plus, Download, FileText, FileSpreadsheet } from 'lucide-react';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 

src/app/(dashboard)/[portSlug]/expenses/scan/page.tsx

@@ -3,7 +3,7 @@
 import { useState, useRef } from 'react';
 import { useParams, useRouter } from 'next/navigation';
 import { useMutation } from '@tanstack/react-query';
-import { Upload, Loader2, Camera, ScanLine } from 'lucide-react';
+import { Upload, Loader2, ScanLine } from 'lucide-react';
 
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';