v0.3.0

Changed

• Breaking. Progress.size is typed ControlSize? instead of dynamic.
  It was the only public field in the kit with no type, so Progress(size: 'large') compiled and failed at run time. Numbers and Size become the
  types the kit already had:

  Before	Now
  size: 20	size: ControlSize.fixed(20)
  size: Size(200, 10)	size: ControlSize.raw(200, 10)
  size: SoftSize.small	unchanged

• Breaking. ProgressSteps had three ways to say one thing — a fill
  parameter, a stepFill parameter and a stepFill getter. Only fill
  remains.

Removed

• Breaking. ControlSize.from(dynamic), whose own doc comment called it
  legacy. With Progress.size typed there is nothing left to convert.
• Breaking. ProgressBorderRadius.from(dynamic) — unused anywhere, and
  untyped.
• Breaking. Progress.onprogressChange, an alias for onProgressChange
  whose lower-case p read as a typo.
• Breaking. The deprecated MessageType typedef. Before 1.0 is when a
  deprecation gets deleted rather than carried on.

None of the four were used by the kit, the gallery, the tests or the docs.

Added

• Upload — a file list with a picker trigger, per-file progress, and
  retry and remove actions. Two layouts: rows, or a grid of tiles for images.

  It picks nothing and sends nothing. Opening a file dialog needs platform
  code and there is no such API in the Flutter SDK, so taking it on would mean
  either a plugin dependency every consumer inherits, or native code for six
  platforms to maintain. Instead Upload draws the state and calls back:
  onPick opens whatever picker the app already uses, and the app owns the
  list, rebuilding items with new progress and status as its upload runs.

  The dashed drop target is drawn here, but the operating system's drag events
  are not Flutter's to give either — pass them in through dragging.

  The gallery demonstrates it against a real file_picker, which is a
  dependency of the example and not of the package. seed_ui still has none
  beyond the Flutter SDK, and its own platform support is unchanged — the
  gallery's iOS deployment target moved to 14.0 to satisfy that plugin, which
  binds the example alone.