Improve search result page titles

[ewlarson]

Summary

• Add a shared search page title builder for keyword, facet-only, advanced, year range, exclusion, and bounding-box searches.
• Use the shared builder in both the client-side Seo fallback and the React Router meta export so browser titles and SSR metadata stay aligned.
• Cover the legacy Geoportal-style f[...] and bbox= URL shapes as well as current include_filters[...] geo/facet params.

Impact

Facet-only and bounding-box search pages now produce distinct page titles such as Place: Wisconsin / Resource Class: Maps / Resource Type: Topographic maps and Bounding Box: -87.1418 28.265814 -50.799027 60.34877, which should make Google Analytics page-title reporting easier to segment.

Validation

• npm test -- searchPageTitle page-titles
• ./node_modules/.bin/prettier --check src/utils/searchPageTitle.ts src/__tests__/utils/searchPageTitle.test.ts src/pages/SearchPage.tsx src/__tests__/pages/page-titles.test.tsx app/routes/search.tsx
• ./node_modules/.bin/eslint src/utils/searchPageTitle.ts src/pages/SearchPage.tsx src/__tests__/utils/searchPageTitle.test.ts src/__tests__/pages/page-titles.test.tsx app/routes/search.tsx (0 errors; existing route Fast Refresh warnings remain)
• git diff --check

Note: full npm run lint still reports existing unrelated lint errors across other frontend files.