Search field at the top of Settings now finds Sidebar Links,
Spoolman, Spool/Color Catalog, all four Failure Detection
sections, Email auth (Advanced + SMTP test), 2FA (TOTP, Email
OTP, Linked Accounts), SSO/OIDC, LDAP Server Config, and the
four Backup sub-cards (GitHub, History, Local, Scheduled).
Replaces the hardcoded searchIndex array in SettingsPage.tsx
with a module-level registry (frontend/src/lib/settingsSearch.ts).
Each settings card calls registerSettingsSearch(...) at module
scope, so adding a new card means adding one colocated line
instead of editing a distant central array. Anchor ids were
added to the corresponding Card elements in the affected
components so scrollIntoView lands on the right section.
maziggy