fix(replays): Record replay trace_ids with span streaming

[mjq]

Replay events' trace_ids property is currently only set in handleTransactionEvent:

sentry-javascript/packages/replay-internal/src/coreHandlers/handleAfterSendEvent.ts

Lines 34 to 43 in 1dfd682

	function handleTransactionEvent(replay: ReplayContainer, event: TransactionEvent): void {
	const replayContext = replay.getContext();
	// Collect traceIds in _context regardless of `recordingMode`
	// In error mode, _context gets cleared on every checkout
	// We limit to max. 100 transactions linked
	if (event.contexts?.trace?.trace_id && replayContext.traceIds.size < 100) {
	replayContext.traceIds.add(event.contexts.trace.trace_id);
	}
	}

This never fires when span streaming is enabled, as we no longer emit transaction events. As a consequence, replays' trace_ids list is always empty under span streaming.

Add another equivalent hook on afterSegmentSpanEnd to record trace_ids when span streaming is enabled.

Only sampled spans are considered, which matches the previous behaviour for transactions.

---

🤖: Claude/Opus 4.6 did a first pass and then I refactored it into shape. Claude wrote the tests though (looked fine to me).

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	27.47 kB	-	-
@sentry/browser - with treeshaking flags	25.91 kB	-	-
@sentry/browser (incl. Tracing)	45.96 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	47.72 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	50.75 kB	-	-
@sentry/browser (incl. Tracing, Replay)	85.21 kB	+0.05%	+39 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	74.81 kB	+0.06%	+39 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	89.91 kB	+0.05%	+43 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	102.57 kB	+0.05%	+42 B 🔺
@sentry/browser (incl. Feedback)	44.66 kB	-	-
@sentry/browser (incl. sendFeedback)	32.26 kB	-	-
@sentry/browser (incl. FeedbackAsync)	37.4 kB	-	-
@sentry/browser (incl. Metrics)	28.54 kB	-	-
@sentry/browser (incl. Logs)	28.78 kB	-	-
@sentry/browser (incl. Metrics & Logs)	29.47 kB	-	-
@sentry/react	29.27 kB	-	-
@sentry/react (incl. Tracing)	48.28 kB	-	-
@sentry/vue	32.62 kB	-	-
@sentry/vue (incl. Tracing)	47.83 kB	-	-
@sentry/svelte	27.5 kB	-	-
CDN Bundle	29.88 kB	-	-
CDN Bundle (incl. Tracing)	47.9 kB	-	-
CDN Bundle (incl. Logs, Metrics)	31.44 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	49.24 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	70.77 kB	+0.05%	+32 B 🔺
CDN Bundle (incl. Tracing, Replay)	85.41 kB	+0.19%	+158 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.69 kB	+0.19%	+159 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	91.2 kB	+0.12%	+106 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.45 kB	+0.11%	+101 B 🔺
CDN Bundle - uncompressed	88.95 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	145.02 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	93.65 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	148.99 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	218.62 kB	+0.07%	+148 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	264.03 kB	+0.06%	+148 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	267.99 kB	+0.06%	+148 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	277.73 kB	+0.06%	+148 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	281.68 kB	+0.06%	+148 B 🔺
@sentry/nextjs (client)	50.67 kB	-	-
@sentry/sveltekit (client)	46.37 kB	-	-
@sentry/core/server	76.32 kB	-	-
@sentry/core/browser	63.48 kB	-	-
@sentry/node-core	61.63 kB	+0.01%	+1 B 🔺
@sentry/node	123.61 kB	-	-
@sentry/node/import (ESM hook with diagnostics-channel injection)	69.95 kB	-	-
@sentry/node/light	50.55 kB	-	-
@sentry/node - without tracing	73.69 kB	-	-
@sentry/aws-serverless	84.89 kB	-	-
@sentry/cloudflare (withSentry) - minified	175.71 kB	-	-
@sentry/cloudflare (withSentry)	437.11 kB	-	-

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