fix(ios): join write requests and screen loads to the traces they belong to

[Makisuo]

push.sync rendered as a single childless root span — no HTTP child, no maple-api server span. Two separate causes, both fixed here.

Writes were never traced

The Swift SDK's URLProtocol interceptor declined any request with an httpBodyStream, on the theory that it only skipped streamed uploads. Foundation hands a URLProtocol every body as a stream — httpBody, from: Data, fromFile: and a delegate-fed stream alike — so it skipped every POST, PUT and PATCH the app makes: no client span, and no traceparent, which left the API's server span in a trace of its own.

Three days of production traffic, org-scoped:

Span	Count	Roots
GET (Client)	893	331
POST (Client)	0	—
push.sync	19	19, all childless

Fixed in maple-swift 0.3.3 (the relay now carries the body across, preserving the app's framing); this bumps the pin.

ui.screen was never a parent

trackScreen returns the span but nothing carries it, and the SDK is right not to make it ambient — a span that runs for the whole visit is not a scope anything can nest inside. So all 347 ui.screen spans arrived as childless roots while the load each one caused sat in its own trace.

Telemetry.Visit registers the open span by screen name and screenLoad hangs under it — the same shape PushOpen already uses to parent a load to the notification tap that asked for it. A tapped notification still wins when there is one, and a span the SDK closed on backgrounding is skipped rather than adopted as a parent that ended before its child began.

Verification

• 107 MapleTracingTests pass, including new cases asserting traceparent and byte-identical bodies on what actually left the process, one per URLSession body API.
• xcodebuild build -scheme Maple succeeds against 0.3.3.
• Post-merge check: POST Client spans should appear with roots = 0, and push.sync traces should contain a maple-api http.server POST span.

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