Handle leading or trailing whitespaces in names

Author: akabiru

app/components/primer/open_project/avatar_with_fallback.rb

@@ -90,7 +90,8 @@ def generate_fallback_svg(alt, size)
       end
 
       def extract_initials(name)
-        return "" if name.blank?
+        name = name.to_s.strip
+        return "" if name.empty?
 
         chars = name.chars
         first = chars[0]&.upcase || ""