feat(session-replay): add background-capture support for Zoning/heatm…

[bravecod]

…ap integration

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[macroscopeapp]

Add background capture support for Zoning/heatmaps by initializing SessionReplay.setupBackgroundCapture with BackgroundCaptureOptions and window messenger integration in session-replay.ts

Introduce BackgroundCaptureOptions, constants for origin and script URL, an async script loader, and a window-based messenger that SessionReplay initializes when backgroundCaptureOptions.enabled is true.

📍Where to Start

Start with SessionReplay.setupBackgroundCapture and initialization flow in session-replay.ts.

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📊 Macroscope summarized f9b440d. 6 files reviewed, 6 issues evaluated, 1 issue filtered, 1 comment posted. View details (Automatic summaries will resume when PR exits draft mode or review begins).

[macroscopeapp]

If document.head is null, the optional chaining silently skips appendChild, leaving the promise pending forever. Consider removing ?. so the try/catch can reject the promise on failure.

Suggested change

	document.head?.appendChild(scriptElement);
	document.head.appendChild(scriptElement);

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[macroscopeapp]

WindowMessenger is not exported from ./libs/messenger — only types are defined there. This import will fail at runtime.

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[macroscopeapp]

Destructuring event.data will throw if the message is null or undefined. Consider adding a guard (e.g., if (!event.data) return) before destructuring.

Suggested change

	const message = event.data as Message<Action>;
	const { action, requestId, data } = message;
	const message = event.data as Message<Action>;
	if (!message) {
	return;
	}
	const { action, requestId, data } = message;

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