Add T1 inventory of Locality-Species UI label usages

[karilint]

Motivation

• Implement approved task T1 from the occurrence-rename plan by producing a complete, peer-reviewable inventory of all user-visible "Locality‑Species" labels in the frontend.
• Provide a clear singular/plural mapping (Occurrence / Occurrences) so subsequent UI-only renames can be done safely without touching backend/DB names.

Description

• Add frontend/tests/locality-species-ui-label-inventory.md which lists every discovered user-facing caption that contains Locality-Species (or variants) and annotates each with file path, context, and target label (singular vs plural).
• Include the previously created feature plan file OCCURRENCE_UI_RENAME_PLAN.md in the change set to show the task provenance and scope (UI-only; no DB/Prisma renames).
• Scope is limited to a documentation/inventory artifact only; no runtime code, API, schema, or permission changes were made.

Testing

• Located occurrences with repository search using rg over frontend/src/** and frontend/tests/** and validated coverage of variants (Locality-Species, Locality Species, Locality-species, locality-species, Locality-Species-Cross-Search).
• Ran project validation flows: npm run prisma (Prisma client generation), npm run tsc (TypeScript check), and npm run lint (ESLint); these completed as part of the local validation and commit hooks.
• No unit/integration tests were modified for this task and no automated tests were added; the inventory file is intended for review and to drive follow-up UI changes.

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Codex Task

[karilint]

@copilot Please review this pull request.

[Copilot]

@karilint I've opened a new pull request, #1064, to work on those changes. Once the pull request is ready, I'll request review from you.