fix(webapp): record real payload size on the trigger span

[1stvamp]

Summary

When a payload is offloaded to object storage the trigger span only saw the small application/store reference, so its size attribute measured the reference rather than the payload. It now prefers the caller-reported pre-offload size (options.payloadSize) when present, so the span reflects the real payload size. Inline payloads are unchanged.

Stacked on #4165, which adds the payloadSize option this reads.

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This is part 2 of 2 in a stack made with GitButler:

•  2  fix(webapp): record real payload size on the trigger span #4166 👈
•  1  feat(sdk,core): offload large batch payloads to object storage #4165

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