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/layout/sidebar.tsx

@@ -20,7 +20,6 @@ import {
   Menu,
   ChevronDown,
   ChevronUp,
-  LogOut,
 } from 'lucide-react';
 
 import { cn } from '@/lib/utils';
@@ -113,7 +112,7 @@ function NavItemLink({
 }) {
   const content = (
     <Link
-      href={item.href as any}
+      href={item.href}
       className={cn(
         'flex items-center gap-3 px-3 py-2 rounded-md text-sm font-medium transition-colors duration-150',
         'text-[#cdcfd6] hover:bg-[#171f35] hover:text-white',