Initial scaffold: Researcher Endorsement frontend

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/skills/custom-hook-crafter/SKILL.md

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+---
+name: custom-hook-crafter
+description: "Extracts reusable hooks (e.g., useArXivFetch, useLocalStorage) to isolate side effects from presentation."
+license: MIT
+triggers:
+  - "create useArXivFetch"
+  - "extract hook"
+  - "make custom hook"
+---
+
+# Custom Hook Crafter
+
+When to use this skill
+
+- Use when component logic involves side effects or needs to be shared across components.
+- Triggered by requests to move data fetching, pagination, caching, or subscriptions into hooks.
+
+Instructions
+
+1. First Step: Identify repeated data-fetching or local-state patterns and define hook API (inputs, outputs, error handling).
+
+2. Second Step: Implement the hook under `src/hooks/` using `useEffect`, `useRef` for abort controllers, and caching strategies as needed.
+
+3. Third Step: Add unit tests and examples showing usage in components; document returned values and loading/error semantics.
+
+Examples
+
+- `useArXivFetch(query, options)` returns `{ data, loading, error, refetch }` and uses an internal cache keyed by query.
+
+Notes
+
+- Prefer small, focused hooks and keep them composable (e.g., `usePagination` + `useArXivFetch`).