Add onReset callback to FormField<T>

[foxmind1]

Use case

While it’s possible to extend FormField and override FormFieldState.reset(), there’s no built-in way to respond to a reset when using FormField directly as a widget. This becomes a problem when creating custom form widgets that need to reset internal state. Unlike onSaved, there’s no onReset callback to easily handle this lifecycle event without subclassing.

Proposal

i’d like to add an optional onReset callback to FormField, similar to onSaved, which gets triggered when FormFieldState.reset() is called.

[github-actions]

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