Document touch breadcrumb label improvements

[antonis]

Once all PRs have landed, we need docs covering the full touch breadcrumb label story:

Build-time label injection (autoInjectSentryLabel)

• The autoInjectSentryLabel option in @sentry/babel-plugin-component-annotate (enabled by default when annotateReactComponents is set)
• How it auto-injects sentry-label from static JSX text children at build time
• Constraints: only static strings, 64-char cap, skips when sentry-label already exists
• The textComponentNames option for custom text components
• How to disable: annotateReactComponents: { autoInjectSentryLabel: false }

Related: #6141

Runtime text extraction from children

• The extractTextFromChildren prop on TouchEventBoundary / Sentry.wrap (default true)
• Extracts text from child fiber nodes as a label fallback when no explicit label is set
• Limits: 3 levels deep, 5 siblings, 64-char truncation
• Automatically disabled when Session Replay's maskAllText is enabled (the default)
• sentry-label (build-time) takes priority over runtime extraction

Related: #6106

Masking interaction

• sentry-label is skipped when maskAllText is enabled or the element is inside a Sentry.Mask boundary
• Runtime text extraction is also skipped inside Sentry.Mask boundaries
• Fallback labels (accessibilityLabel, aria-label, testID) always work regardless of masking
• To enable both sentry-label and text extraction with replay, set maskAllText: false in mobileReplayIntegration

Related: #6142

Label priority chain

1. sentry-label prop (build-time injected or manually set) — skipped when masked
2. Custom labelName prop
3. accessibilityLabel
4. aria-label
5. testID
6. Text extracted from children — skipped when masked

Docs locations to update

• docs/platforms/react-native/configuration/touchevents.mdx — runtime extraction, masking interaction, label priority
• docs/platforms/react-native/integrations/component-names.mdx — autoInjectSentryLabel option alongside existing data-sentry-component docs

Repo: getsentry/sentry-docs

[linear-code]

RN-617