Rename Locality-Species UI labels to Occurrence/Occurrences

[Copilot]

User-facing "Locality-Species" labels are replaced with "Occurrence/Occurrences" across the frontend. Backend identifiers (now_ls, API contracts, Prisma schema) are untouched.

Changes

• New constants file frontend/src/constants/occurrenceLabels.ts — single source of truth for all occurrence-related UI strings:

  export const occurrenceLabels = {
    singular: 'Occurrence',
    plural: 'Occurrences',
    crossSearchTitle: 'Occurrences',
    informationSectionTitle: 'Occurrences',
    addNewButton: 'Add new Occurrence',
  } as const

• Router — added /occurrence/:id? alongside the existing /crosssearch/:id? for backward compatibility; CrossSearchTable url prop updated to "occurrence" so row-click navigation targets the new route

• NavBar — "Locality-Species → /crosssearch" nav entry replaced with "Occurrences → /occurrence"

• FrontPage — statistics counter label updated from "Locality-species" to occurrenceLabels.plural

• CrossSearchTable — title updated from "Locality-Species-Cross-Search" to occurrenceLabels.crossSearchTitle

• LocalitySpeciesTab — Grouped section title ("Locality-Species Information" → occurrenceLabels.informationSectionTitle) and modal button text ("Add new Locality Species" → occurrenceLabels.addNewButton)

• SpeciesDetails — tab title "Locality Species" → occurrenceLabels.plural

• TableView — showNewButton condition replaced brittle title-string comparison with !isCrossSearchTable

• Tests — NavBar, TableView, and LocalitySpeciesTab tests updated to assert new labels; new NavBar.test.tsx verifies nav entry renders "Occurrences"

• Docs — locality-species-ui-label-inventory.md inventory file and CHANGELOG updated

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