Phase 3.5 구현: 커서 위치 히스토리 팝업 (D3RO 고유 기능)

- HistoryPopup: Vanilla JS, 다크 카드(#242427), 앰버 악센트(#f25b29)
- Ctrl+Shift+V → 커서 위치에 최근 10건 히스토리 팝업
- Arrow↑↓ 선택, Enter 붙여넣기, 1-9 직접 선택, ESC 닫기
- focusable: false → 활성 앱 포커스 유지
- 2-phase 리사이즈, 등장/퇴장 애니메이션
- WindowManager: HistoryPopup 관리 + 프리로딩
- Bootstrap: globalShortcut 등록 + IPC 연동

src/renderer/popups/history-popup/style.css

@@ -0,0 +1,124 @@
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  background: transparent;
+  overflow: hidden;
+  -webkit-app-region: no-drag;
+  user-select: none;
+}
+
+#root {
+  width: 100%;
+  height: 100%;
+}
+
+.history-popup {
+  background: #242427;
+  border: 1px solid rgba(255, 255, 255, 0.08);
+  border-radius: 12px;
+  padding: 6px;
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
+  opacity: 0;
+  transform: translateY(4px) scale(0.98);
+  transition: opacity 0.15s ease-out, transform 0.15s ease-out;
+  min-width: 300px;
+  max-width: 420px;
+}
+
+.history-popup.visible {
+  opacity: 1;
+  transform: translateY(0) scale(1);
+}
+
+.history-popup.hiding {
+  opacity: 0;
+  transform: translateY(-4px) scale(0.98);
+  transition-duration: 0.1s;
+  transition-timing-function: ease-in;
+}
+
+.items {
+  max-height: 360px;
+  overflow-y: auto;
+}
+
+.item {
+  display: flex;
+  align-items: center;
+  padding: 8px 10px;
+  border-radius: 8px;
+  cursor: pointer;
+  transition: background 100ms;
+  gap: 8px;
+  position: relative;
+}
+
+.item:hover,
+.item.selected {
+  background: rgba(255, 255, 255, 0.06);
+}
+
+.item.selected::before {
+  content: '';
+  position: absolute;
+  left: 0;
+  top: 4px;
+  bottom: 4px;
+  width: 3px;
+  background: #f25b29;
+  border-radius: 1.5px;
+}
+
+.item-number {
+  color: rgba(255, 255, 255, 0.3);
+  font-size: 11px;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", monospace;
+  min-width: 16px;
+  text-align: center;
+}
+
+.item-text {
+  flex: 1;
+  color: rgba(255, 255, 255, 0.87);
+  font-size: 13px;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+  line-height: 1.4;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.item-time {
+  color: rgba(255, 255, 255, 0.3);
+  font-size: 11px;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.hints {
+  display: flex;
+  justify-content: center;
+  gap: 16px;
+  padding: 6px 0 4px;
+  border-top: 1px solid rgba(255, 255, 255, 0.06);
+  margin-top: 4px;
+}
+
+.hints span {
+  color: rgba(255, 255, 255, 0.25);
+  font-size: 10px;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+}
+
+.empty-state {
+  color: rgba(255, 255, 255, 0.4);
+  font-size: 13px;
+  text-align: center;
+  padding: 24px 16px;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+}