add local TailwindCSS, fix side bar folder view, add more function to Markdown editor and allow .markdown files

internal/utils/utils.go

@@ -136,7 +136,15 @@ func GetFolderContents(folderPath string, cfg *config.Config) ([]models.FileInfo
 
 			// Set display name based on file type
 			if fileInfo.Type == models.FileTypeMarkdown {
-				fileInfo.DisplayName = strings.TrimSuffix(entry.Name(), ".md")
+				name := entry.Name()
+				lower := strings.ToLower(name)
+				if strings.HasSuffix(lower, ".markdown") {
+					fileInfo.DisplayName = name[:len(name)-len(".markdown")]
+				} else if strings.HasSuffix(lower, ".md") {
+					fileInfo.DisplayName = name[:len(name)-len(".md")]
+				} else {
+					fileInfo.DisplayName = strings.TrimSuffix(name, filepath.Ext(name))
+				}
 			} else {
 				fileInfo.DisplayName = entry.Name()
 			}