Remove redundant section header from differentials Presentations/Diagnoses streams

[BigSimmo]

Summary

• Removed the "Presentation pathways" / "Clinical entries" <h2> heading and its subtitle from DifferentialStreamWorkspace (src/components/differentials/differential-stream-workspace.tsx) so result cards render directly below the search results band on both /differentials/presentations and /differentials/diagnoses, instead of behind a duplicate label.
• Dropped the now-unused entriesLabel field from the per-stream copy table.
• Updated the DOM test and the Playwright route-coverage spec that asserted on the removed heading text.

Verification

• npm run typecheck — clean
• npx eslint src/components/differentials/differential-stream-workspace.tsx tests/differential-stream-page.dom.test.tsx tests/ui-route-coverage.spec.ts — clean
• npx prettier --check <changed files> — "All matched files use Prettier code style!"
• node scripts/run-vitest.mjs run tests/differential-stream-page.dom.test.tsx — 7 passed (7)
• npm run verify:pr-local — not run: this is a localized, non-behavioural text/heading removal confined to one component's section header (no shared chrome/composer/routing/data change); the focused DOM test plus typecheck/lint above cover the plausible regression surface for this diff.
• npm run verify:ui — not run for the same reason; no shared search-chrome, composer, or cross-page UI foundation was touched, only a page-local <h2>/subtitle removed. Playwright's ui-route-coverage.spec.ts assertion on this heading was updated to match, but the full Chromium gate was not run.

Risk and rollout

• Risk: Very low — pure UI copy/markup removal (a redundant duplicate section label) with no logic, data, or routing change.
• Rollback: Revert this commit; the removed heading/subtitle strings are preserved in the diff.
• Provider or production effects: None.

Notes

• This diff does not touch ingestion, answer generation, search/ranking, source rendering, document access, privacy, production env, or clinical output, so the Clinical Governance Preflight section is not applicable.

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Caution

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[github-actions]

CI triage

CI failed on this PR. Automated classification of the 2 failed job(s):

• Safety and config checks — needs investigation: inspect the failing step and uploaded diagnostics; rerun only after classifying the cause.
• PR required — needs investigation: inspect the failing step and uploaded diagnostics; rerun only after classifying the cause.

Compared with main CI run #11455 (success).

Classification is evidence routing, not permission to ignore a failure. Exact quarantined Playwright identities remain governed by the flake ledger.