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Feature Request: Pie/Donut Chart Widget

Feature Request: Pie/Donut Chart Widget: a task in LegoFlow-SWE (Harbor dataset). We need a new widget that displays a donut‑style multi‑value chart on a braille‑based canvas. The widget must be importable as github.com/mum4k/termdash/widgets/pie and implement the standard widgetapi.Widget…

The task

We need a new widget that displays a donut‑style multi‑value chart on a braille‑based canvas. The widget must be importable as `github.com/mum4k/termdash/widgets/pie` and implement the standard `widgetapi.Widget` interface (`Draw`, `Keyboard`, `Mouse`, `Options`).

Part of Lego-X/LegoFlow-SWE.