Scripting 4+

# New Features

## Headless Browser Fetch
The fetch method now simulates requests as if made from a headless browser, providing more accurate web interactions and cookie handling.

## Request / Response Enhancements
Added a new handleRedirect property to Request and RequestInit for controlling redirect behavior.
The old shouldAllowRedirect property has been deprecated.
Added a new cookies property to Response, allowing access to cookies returned in the response.

## Background Networking
Introduced new APIs for running download and upload tasks in the background:
- BackgroundURLSession
- URLSessionDownloadTask
- URLSessionUploadTask

## BackgroundKeeper
Added BackgroundKeeper to request background runtime access, enabling tasks to continue running while the app is in the background.

## AVPlayer Metadata Access
Added loadCommonMetadata() and loadMetadata() methods, along with a new AVMetadataItem class for accessing detailed metadata of the currently playing asset.

## Pasteboard API
Introduced a new Pasteboard API for reading and writing clipboard data.
The old Clipboard API has been deprecated.

## Gesture System
Added comprehensive gesture APIs and modifiers:
- View modifiers: gesture, highPriorityGesture, simultaneousGesture, defersSystemGestures, and the new lineSpacing modifier.
- Gesture APIs: Gesture, DragGesture, LongPressGesture, MagnifyGesture, RotateGesture, TapGesture.
These additions bring gesture and layout handling closer to native SwiftUI behavior.

## UIImage Utilities
Added new utility methods to the UIImage class:
- Instance methods: toJPEGBase64String(), toPNGBase64String(), toJPEGData(), and toPNGData().
- Static method: fromBase64String() for creating images directly from Base64-encoded strings.

## Widget System Update
Widgets are now divided into two kinds:
- User Widgets: for completed, published widgets.
- Test Widgets: for widgets under development.

This separation prevents interference during refresh.
Added new methods Widget.reloadUserWidgets() and Widget.reloadTestWidgets() to reload each type independently.

## ControlWidget Enhancements
Added a new Button control type that can open the app and execute a specified script.

## CustomKeyboard Environment
The Safari API is now available within the CustomKeyboard environment.

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# Improvements

## Knowledge Base Import
Fixed the issue preventing documents from being imported from external directories into knowledge bases.

## Widget Rendering
Fixed an issue where widgets failed to render local images correctly.

## Text File Handling
Fixed a bug where tapping a text file to open it in Scripting could repeatedly trigger the editor view.

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# Fixes

## Health API
- Fixed an issue where Health.queryStatistics and Health.queryStatisticsCollection could not read data correctly.
- Fixed an issue in the HealthStatistics class where quantity methods failed to return correct values when a source parameter was provided.

## Widget Execution (iOS 26)
Fixed an issue where tapping a widget to run a script on iOS 26 could trigger the action twice.

## Modal Dismissal After Script Exit
Fixed an issue where views such as Safari, DocumentPicker, Photos, and QuickLook were not automatically closed after calling Script.exit().