Initial scaffold: Researcher Endorsement frontend

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

.github/skills/zustand-store-manager/SKILL.md

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+---
+name: zustand-store-manager
+description: "Generates typed Zustand stores (usePaperStore, useAuthStore) with devtools and persist middleware for localStorage."
+license: MIT
+triggers:
+  - "create zustand store"
+  - "generate usePaperStore"
+  - "persist zustand"
+---
+
+# Zustand Store Manager
+
+When to use this skill
+
+- Use when centralizing client state (papers, endorsements, likes, user profile) without a backend.
+- Triggered by requests to scaffold or update stores, add persistence, or wire devtools.
+
+Instructions
+
+1. First Step: Create typed store files under `src/stores/` (e.g., `usePaperStore.ts`) using `create` from `zustand` and `persist`/`devtools` middleware.
+
+2. Second Step: Expose actions and selectors that the UI will consume (`addEndorsement`, `toggleLike`, `fetchPapers` placeholder).
+
+3. Third Step: Document how to access state in components and how to reset/seed state for tests.
+
+Examples
+
+- `usePaperStore` exposes `papers`, `loading`, `addEndorsement(paperId, endorser)` and `reset()`.
+
+Notes
+
+- Include clear type definitions for the store payloads to keep UI and store in sync.
+- Recommend `zustand/middleware` persist name (`arxiv-social-storage`) and a migration strategy when types change.