fix(trace): Prefer transaction data EAP instead of nodestore

[mjq]

Transaction events' contexts, extra, and breadcrumbs are now deprecated under span streaming (replaced with attributes, attributes, and logs, respectively). However, SDKs that are still sending this data should still have it visible.

These transaction fields are serialized to attributes in Relay (getsentry/relay#6286) and then emitted by the trace item details API (#121461). Use them in preference to the transaction event. We keep reading the transaction event so that data predating this data being written to EAP (Aug 6, 2026) continue to work.

Note that:

• The Request section is now missing, whether from a transaction event or EAP. All this data is already written to attributes (from a transaction or a streaming span) so it hasn't disappeared, it's just in a new form.
• EAP currently lacks the _meta equivalent for these fields, so we've lost annotations for redactions, etc when this data is sourced from EAP. I'm going to restore this soon (feat(transaction): Extract contexts, extra, breadcrumbs meta relay#6296), but I don't want to wait for it (better to show the data without annotations than to have no data at all).

Fixes BROWSE-673.

[github-actions]

📊 Type Coverage Diff

Metric	Before	After	Delta
Coverage	94.20%	94.19%	🔴 -0.01%
Typed	134,690	134,699	🟢 +9
Untyped	8,298	8,306	🔴 +8

🔍 10 new type safety issues introduced

any-typed symbols (9 new)

File	Line	Detail
static/app/components/events/breadcrumbs/utils.tsx	222	meta (param(binding))
static/app/views/performance/newTraceDetails/traceDrawer/details/span/eapSections/contexts.tsx	34	extra (param(binding))
static/app/views/performance/newTraceDetails/traceDrawer/details/span/index.tsx	480	extra (var)
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/index.tsx	145	breadcrumbMeta (var)
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/sections/additionalData.tsx	52	<pattern> (param)
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/sections/additionalData.tsx	53	extra (param(binding))
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/sections/additionalData.tsx	54	meta (param(binding))
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/sections/breadCrumbs.tsx	30	<pattern> (param)
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/sections/breadCrumbs.tsx	32	meta (param(binding))

Type assertions (as) (1 new)

File	Line	Detail
static/app/views/performance/newTraceDetails/traceDrawer/details/transaction/index.tsx	143	`as EntryBreadcrumbs

This is informational only and does not block the PR.

[linear-code]

BROWSE-673

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[nikkikapadia]

lgtm!