fix: add missing size property to DynamicIcon class

Fixes #5660 where rx.icon size attribute was ignored when using
dynamic state variables vs static strings.

The DynamicIcon class was missing the size: Var[int] property
definition, causing size to be treated as CSS style instead of
a direct component prop. This resulted in dynamic icons falling
back to Lucide React's default size of 24px instead of using
the specified size.

Changes:
- Add size: Var[int] property to DynamicIcon class
- Ensures consistent size handling between static and dynamic icons
- Both now pass size as proper component props to Lucide React

Author: geekalaa

reflex/components/lucide/icon.py

@@ -93,6 +93,7 @@ class DynamicIcon(LucideIconComponent):
     tag = "DynamicIcon"
 
     name: Var[str]
+    size: Var[int]
 
     def _get_imports(self):
         _imports = super()._get_imports()