Add IsPinned and IsDeleted properties to Note entity with corresponding database configurations and migrations

This commit enhances the Note entity by introducing two new properties: IsPinned and IsDeleted, allowing for better management of note visibility and status. The NoteConfiguration class has been updated to include indexes for these properties, improving query performance. Additionally, new migrations have been created to reflect these changes in the database schema. The UI components have been updated to support pinning and restoring notes, enhancing user interaction and functionality within the note management system.

WebApp/Services/MarkdownHelper.cs

@@ -12,6 +12,22 @@ public static class MarkdownHelper
         .UseAdvancedExtensions()
         .Build();
 
+    // Compiled regex patterns for stripping markdown
+    private static readonly Regex MarkdownLinkRegex = 
+        new(@"\[([^\]]+)\]\([^\)]+\)", RegexOptions.Compiled);
+    private static readonly Regex BoldRegex = 
+        new(@"\*\*([^\*]+)\*\*", RegexOptions.Compiled);
+    private static readonly Regex ItalicRegex = 
+        new(@"\*([^\*]+)\*", RegexOptions.Compiled);
+    private static readonly Regex InlineCodeRegex = 
+        new(@"`([^`]+)`", RegexOptions.Compiled);
+    private static readonly Regex HeaderRegex = 
+        new(@"#+\s+", RegexOptions.Compiled);
+    private static readonly Regex NewlineRegex = 
+        new(@"\n+", RegexOptions.Compiled);
+    private static readonly Regex HtmlTagRegex = 
+        new(@"<[^>]+>", RegexOptions.Compiled);
+
     /// <summary>
     /// Converts markdown text to HTML.
     /// </summary>
@@ -45,4 +61,35 @@ public static class MarkdownHelper
         
         return html;
     }
+
+    /// <summary>
+    /// Strips markdown formatting from content and returns plain text for preview.
+    /// </summary>
+    /// <param name="content">The markdown content to strip.</param>
+    /// <param name="maxLength">Maximum length of the preview. If 0 or negative, no truncation is performed.</param>
+    /// <returns>Plain text preview with markdown formatting removed.</returns>
+    public static string StripMarkdownPreview(string? content, int maxLength = 0)
+    {
+        if (string.IsNullOrWhiteSpace(content))
+            return string.Empty;
+
+        // Strip markdown formatting for preview using compiled regex
+        var plainText = MarkdownLinkRegex.Replace(content, "$1"); // Replace markdown links with link text
+        plainText = BoldRegex.Replace(plainText, "$1"); // Remove bold
+        plainText = ItalicRegex.Replace(plainText, "$1"); // Remove italic
+        plainText = InlineCodeRegex.Replace(plainText, "$1"); // Remove inline code
+        plainText = HeaderRegex.Replace(plainText, ""); // Remove headers
+        plainText = NewlineRegex.Replace(plainText, " "); // Replace newlines with spaces
+        plainText = HtmlTagRegex.Replace(plainText, ""); // Remove HTML tags
+
+        plainText = plainText.Trim();
+
+        // Truncate if maxLength is specified and content exceeds it
+        if (maxLength > 0 && plainText.Length > maxLength)
+        {
+            return plainText.Substring(0, maxLength - 3) + "...";
+        }
+
+        return plainText;
+    }
 }