Move Array allocation outside loop in select options

Avoids allocating a new array on each iteration when checking
if a value is selected.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nimmolo

lib/superform/rails/components/select.rb

@@ -47,10 +47,10 @@ def view_template(&block)
         end
 
         def options(*collection)
+          # Handle both single values and arrays (for multiple selects)
+          selected_values = Array(field.value)
           map_options(collection).each do |key, value|
-            # Handle both single values and arrays (for multiple selects)
-            selected = Array(field.value).include?(key)
-            option(selected: selected, value: key) { value }
+            option(selected: selected_values.include?(key), value: key) { value }
           end
         end