Use browser history for header back arrow

[BigSimmo]

Motivation

• The sitewide header back arrow on info and search pages was navigating to hardcoded section/home routes instead of returning the user to the actual previous page in browser history.

Description

• Replace the route-specific redirect logic for the header/mobile back control with a direct router.back() call so the button uses the browser history.
• The change is confined to src/components/clinical-dashboard/global-search-shell.tsx where the onMobileBack handler was simplified to () => router.back().

Testing

• Ran npm run workflow:design-sweep -- --write-evidence which completed successfully for the design sweep evidence stage.
• Installed dependencies with npm ci and the install completed without reported vulnerabilities.
• Linted the modified file with npx eslint src/components/clinical-dashboard/global-search-shell.tsx --max-warnings 0 and it passed without warnings.
• Ran npm run typecheck and the TypeScript check passed; npm run ensure (local dev server) was attempted but the Next dev server did not become ready in this environment due to external Google font fetch failures, so a running local UI smoke test could not be completed.

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Codex Task

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This pull request has been ignored for the connected project sjrfecxgysukkwxsowpy because there are no changes detected in supabase directory. You can change this behaviour in Project Integrations Settings ↗︎.

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[BigSimmo]

Closed as deliberately rejected/superseded. Browser-history back can eject deep-linked users to an external or unrelated page and is nondeterministic across entry paths. #1161 instead landed explicit canonical in-app return targets, including allowlisted mode-aware privacy returns, as merge 7a81cfaa9064d7e1c4d50488e2dfa0926887a0e9 with full hosted checks green. The branch remains recoverable in the reconciliation bundle.