Apply saved standards selection on search and explorer

Parent: #1079 · Depends on CRE-page apply-view ticket · Project: https://github.com/orgs/OWASP/projects/60

What

The same saved selection that filters CRE pages should apply to search results and explorer.

Without this, the feature feels broken: /cre/… is quiet, search and explorer still dump every standard.

Surfaces

• Text search (/rest/v1/text_search / SearchName.tsx / DocumentNode)
• Explorer (/explorer, including “show relevant standards” links that already emit applyFilters URLs)

Reuse the same mechanism as CRE pages (URL hydrate or include_only). Do not add a second persistence format.

Success

Logged-in user with a non-empty selection sees only those standards (plus OpenCRE) in search hits and explorer-linked CRE views, with the same “Show all” bypass as CRE pages.

Anonymous search/explorer stay unfiltered.

Out of scope

Map Analysis / ga_standards (separate ticket). Chat RAG (later ticket).

Trace the CRE-page saved-selection mechanism first, then inspect /rest/v1/text_search, SearchName.tsx, DocumentNode, and /explorer. Apply the existing URL hydrate or include_only path without introducing another persistence format. Done means logged-in users see only selected standards plus OpenCRE, Show all bypasses the filter, and anonymous search and explorer remain unfiltered.