fix: await delivery in analytics().sendEvent()

[vklimontovich]

What

analytics().sendEvent() awaited the dispatch kickoff but not the completion promise:

await dispatchEventInternal(event, ctx); // returns { clientActions, completion } synchronously
return { ok: true };

dispatchEventInternal returns immediately, so backend writes (Neon insert, Jitsu POST, …) were effectively fire-and-forget.

Why it matters

The middleware page-view path defers completion with after() so it survives past the response. An explicit sendEvent from an API route / server action has no such hook — in a serverless function the process can freeze right after the response returns, dropping the in-flight writes. So await sendEvent() did not guarantee delivery (it works locally only because the dev server stays alive).

Fix

Await completion:

const { completion } = dispatchEventInternal(event, ctx);
await completion;
return { ok: true };

Now await sendEvent() means "delivered". The middleware page-view path is unchanged (it never calls sendEvent).

Testing

typecheck + all tests pass.