Transformed a small subset of samples to functional components

[Copilot]

Following the refactor of LinearStepperFunctional.tsx (which replaced useEffect+addEventListener with onInput on native <form> elements), the corresponding rule in the generation guide was still documenting the old pattern.

Changes — FUNCTIONAL_COMPONENT_GENERATION_GUIDE.md §15

• Functional template: dropped the useEffect block; replaced with a useCallback handler at component scope and onInput={handleInput} on each <form> element.
• Rules: updated to prefer React's synthetic onInput/onChange props (Ignite UI web components bubble standard DOM events through the shadow DOM, so a parent <form> catches them); kept a fallback note for cases where useEffect+addEventListener is still warranted (elements outside the React tree, non-standard event names).

// Before
useEffect(() => {
    const handleInput = () => checkActiveStepValidity(linear);
    infoForm?.addEventListener('igcInput', handleInput);
    return () => infoForm?.removeEventListener('igcInput', handleInput);
}, [linear, checkActiveStepValidity]);

// After
const handleInput = useCallback(
    () => checkActiveStepValidity(linear),
    [linear, checkActiveStepValidity]
);
<form ref={infoFormRef} onInput={handleInput}>...</form>

[gedinakova]

This renderer is not used anywhere. Check if it's an omission or it should be deleted. @copilot

[Copilot]

The renderer was unused (not referenced in JSX or anywhere else in the component), so it was deleted along with the now-dead imports (ComponentRenderer, PropertyEditorPanelDescriptionModule, DataPieChartDescriptionModule, ItemLegendDescriptionModule) and the unused useRef import. Fixed in 9e9a075.