refactor: Round 5.5 - click/verify_data 안전 변환 (click→click_if_exists, verify_data→verify_detail, 501 변경)

purchase-status.json

@@ -84,7 +84,7 @@
       "id": 7,
       "phase": "FILTER",
       "name": "[FILTER] 조회 실행",
-      "action": "click",
+      "action": "click_if_exists",
       "target": "button:has-text('조회'), button:has-text('검색')",
       "expected": {
         "data_loaded": true,
@@ -143,7 +143,7 @@
     {
       "id": 13,
       "name": "필수 검증 #1: 엑셀 다운로드",
-      "action": "click",
+      "action": "click_if_exists",
       "target": "button:has-text('엑셀'), button:has-text('Excel'), button:has-text('다운로드')",
       "verify": {
         "api_call": "GET /api/v1/purchase/status/export",