fix: prevent ErrorBoundary onError from spamming null callbacks on every update

[AshayK003]

Problem

The componentDidUpdate method in ErrorBoundary unconditionally called invokeErrorCallback(), which fires this.props.onError(null, componentId) on every re-render — even when no error exists. This spams consumer error monitoring with null-error notifications on every component update.

Root Cause

componentDidUpdate() {
    if (this.props.error && !this.state.error) {
        this.setState({ error: this.props.error });
    }
    this.invokeErrorCallback();  // ← fires on every update, even without error
}

Fix

Guard invokeErrorCallback() behind this.state.error, so it only fires when an actual error exists in state:

if (this.state.error) {
    this.invokeErrorCallback();
}

Testing

Snapshot test already exists. The render output is unchanged — only the callback invocation path is gated. No visual regression.