Merge and optimize server modal with setting branch features

src/styles/modal.css

@@ -180,6 +180,10 @@
   background-color: var(--white);
 }
 
+.form-group textarea {
+  resize: none;
+}
+
 .form-group input:focus, 
 .form-group select:focus, 
 .form-group textarea:focus { 
@@ -226,6 +230,9 @@
 }
 
 .history-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
   margin-bottom: 1rem;
 }
 
@@ -238,6 +245,35 @@
   color: var(--text-main);
 }
 
+/* 읽기 전용 필드 (자산번호 등) 통일 스타일 */
+.is-readonly-field {
+  border-color: transparent !important;
+  background-color: transparent !important;
+  pointer-events: none !important;
+  color: var(--text-main) !important;
+  font-weight: 600 !important;
+  cursor: default;
+  padding-left: 0 !important;
+}
+
+/* 입력 필드 + 버튼 그룹 (자산번호 생성 등) */
+.input-with-btn {
+  display: flex;
+  gap: 0.5rem;
+  align-items: center;
+  width: 100%;
+}
+
+.input-with-btn input {
+  flex: 1;
+  min-width: 0; /* flex 컨테이너 안에서 너비 압축 방지 */
+}
+
+.input-with-btn .btn {
+  flex-shrink: 0;
+  white-space: nowrap;
+}
+
 .history-timeline {
   flex: 1;
   overflow-y: auto;