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758ff7c0 - Raise helpful errors when event handler inputs/outputs are mistyped (#13470)

Raise helpful errors when event handler inputs/outputs are mistyped (#13470) * Raise helpful errors when event handler inputs/outputs are mistyped When an event handler receives a wrong-typed input or returns a wrong-typed output, the error was raised deep inside a component's pre/postprocess method and gave no indication of which component/argument was at fault. Wrap the pre/postprocess calls in preprocess_data/postprocess_data so that any exception is re-raised as a new ComponentProcessingError that identifies the component index, component type, the expected type, the offending value, and the event handler name, while chaining the original exception. Fixes #3522 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * Fix backend typecheck: access pre/postprocess via getattr Block has no preprocess/postprocess attribute (those live on components.Component), so resolve the method dynamically to satisfy ty. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>