fix:매입 필터 버튼 배경색 변경 (amber→orange, 가시성 개선)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

resources/views/finance/partners.blade.php

@@ -263,7 +263,7 @@ function PartnersManagement() {
                     </div>
                     <div className="flex gap-1">
                         {[{v:'all',l:'전체'},{v:'sales',l:'매출'},{v:'purchase',l:'매입'}].map(o => (
-                            <button key={o.v} onClick={() => setFilterTradeType(o.v)} className={`flex-1 px-3 py-2 rounded-lg text-sm font-medium ${filterTradeType === o.v ? (o.v === 'sales' ? 'bg-blue-600 text-white' : o.v === 'purchase' ? 'bg-amber-600 text-white' : 'bg-gray-800 text-white') : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}`}>{o.l}</button>
+                            <button key={o.v} onClick={() => setFilterTradeType(o.v)} className={`flex-1 px-3 py-2 rounded-lg text-sm font-medium ${filterTradeType === o.v ? (o.v === 'sales' ? 'bg-blue-600 text-white' : o.v === 'purchase' ? 'bg-orange-600 text-white' : 'bg-gray-800 text-white') : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}`}>{o.l}</button>
                         ))}
                     </div>
                     <select value={filterType} onChange={(e) => setFilterType(e.target.value)} className="px-3 py-2 border border-gray-300 rounded-lg"><option value="all">전체 업태</option>{[...new Set(partners.map(p => p.type).filter(Boolean))].map(t => <option key={t} value={t}>{t}</option>)}</select>