Add missing prop descriptions to PreviewCardRoot

- Add description for default_open prop
- Add description for open prop
- Add description for on_open_change prop
- Add description for delay prop with default value
- Follow established comment format for consistency

Co-Authored-By: Carlos Cutillas <carlos@reflex.dev>

Author: devin-ai-integration[bot]

reflex_ui/components/base/preview_card.py

@@ -43,15 +43,19 @@ class PreviewCardRoot(PreviewCardBaseComponent):
 
     tag = "PreviewCard.Root"
 
+    # Whether the preview card is open by default. Defaults to False.
     default_open: Var[bool]
 
+    # Whether the preview card is open.
     open: Var[bool]
 
+    # Event handler called when the preview card is opened or closed.
     on_open_change: EventHandler[passthrough_event_spec(bool, dict, str)]
 
     # Event handler called after any animations complete when the preview card is opened or closed.
     on_open_change_complete: EventHandler[passthrough_event_spec(bool)]
 
+    # How long to wait before opening the preview card on hover. Specified in milliseconds. Defaults to 600.
     delay: Var[int]
 
     # How long to wait before closing the preview card that was opened on hover. Specified in milliseconds. Defaults to 300.