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/shared/custom-fields-section.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useCallback, useRef, useState } from 'react';
+import { useRef, useState } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { ChevronDown, ChevronRight } from 'lucide-react';
 
@@ -15,7 +15,6 @@ import {
   SelectTrigger,
   SelectValue,
 } from '@/components/ui/select';
-import { Button } from '@/components/ui/button';
 import { apiFetch } from '@/lib/api/client';
 
 // ─── Types ────────────────────────────────────────────────────────────────────

src/components/shared/data-table.tsx

@@ -6,9 +6,7 @@ import {
   getCoreRowModel,
   useReactTable,
   type ColumnDef,
-  type SortingState,
   type RowSelectionState,
-  type PaginationState,
 } from '@tanstack/react-table';
 import { ArrowDown, ArrowUp, ArrowUpDown, Loader2 } from 'lucide-react';
 

src/components/shared/detail-layout.tsx

@@ -37,7 +37,7 @@ export function DetailLayout({
   function handleTabChange(tabId: string) {
     const params = new URLSearchParams(searchParams.toString());
     params.set('tab', tabId);
-    router.replace(`${pathname}?${params.toString()}` as any, { scroll: false });
+    router.replace(`${pathname}?${params.toString()}`, { scroll: false });
   }
 
   if (isLoading) {

src/components/shared/empty-state.tsx

@@ -1,4 +1,4 @@
-import { type ReactNode, type ElementType } from 'react';
+import { type ElementType } from 'react';
 import { cn } from '@/lib/utils';
 import { Button } from '@/components/ui/button';