[미리보기] 버튼 상태 저장, 앱 실행시 직전 상태 적용

src/renderer/renderer.js

@@ -64,10 +64,15 @@ window.api.onFullscreenChange((isFullscreen) => {
 
 // 앱 시작 시 마지막 폴더 또는 홈 디렉토리 로드
 (async () => {
-  const [lastFolder, homeDir] = await Promise.all([
+  const [lastFolder, homeDir, previewOn] = await Promise.all([
     window.api.getLastFolder(),
     window.api.getHomeDir(),
+    window.api.getPreviewOn(),
   ]);
+
+  btnPreviewToggle.classList.toggle('active', previewOn);
+  hoverPreview.setEnabled(previewOn);
+
   const target = lastFolder || homeDir;
   await fileExplorer.loadTree(homeDir, target);
   await loadFolder(target);
@@ -87,6 +92,7 @@ document.addEventListener('keydown', (e) => {
 btnPreviewToggle.addEventListener('click', () => {
   const on = btnPreviewToggle.classList.toggle('active');
   hoverPreview.setEnabled(on);
+  window.api.setPreviewOn(on);
 });
 btnSortName.addEventListener('click', () => sortFiles('name'));
 btnSortDate.addEventListener('click', () => sortFiles('date'));