Fix editor log search ignoring BBCode formatting in messages

When searching in the editor output log, messages with BBCode formatting
(like [color=red]text[/color]) would not be found when searching for the
plain text content. For example, searching for "Example is" in a message
"[color=blue]EXAMPLE[/color] is super cool" would fail to find the match.

editor/editor_log.h

@@ -140,6 +140,9 @@ private:
 	Button *show_search_button = nullptr;
 	LineEdit *search_box = nullptr;
 
+	// Reusable RichTextLabel for BBCode parsing during search
+	RichTextLabel *bbcode_parser = nullptr;
+
 	// Reference to the "Output" button on the toolbar so we can update its icon when warnings or errors are encountered.
 	Button *tool_button = nullptr;