Description

We need to add support for the BackdropFilter widget in Stac. This includes:

✅ Tasks

• Add a new widget parser for BackdropFilter

  Support configuration for filter (e.g., ImageFilter.blur)

  Allow child widgets

  Add an example in the gallery app (e.g., a frosted glass effect)

  Write documentation for usage
  To pick up a draggable item, press the space bar. While dragging, use the arrow keys to move the item. Press space again to drop the item in its new position, or press escape to cancel.

📄 Example JSON

{
  "type": "backdropFilter",
  "filter": {
    "type": "blur",
    "sigmaX": 5.0,
    "sigmaY": 5.0
  },
  "child": {
    "type": "Container",
    "padding": 16,
    "color": "#ffffff80",
    "child": {
      "type": "Text",
      "value": "Frosted glass effect"
    }
  }
}

📚 Resources

• Flutter docs: https://api.flutter.dev/flutter/widgets/BackdropFilter-class.html
• ImageFilter: https://api.flutter.dev/flutter/dart-ui/ImageFilter-class.html