Initial scaffold: Researcher Endorsement frontend

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

.github/skills/action-dispatcher/SKILL.md

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+---
+name: action-dispatcher
+description: "Implements store actions for social behaviors (toggleEndorsement, toggleLike, requestEndorsement) and keeps logic testable."
+license: MIT
+triggers:
+  - "generate toggleEndorsement"
+  - "create store actions"
+  - "add social handlers"
+---
+
+# Action Dispatcher
+
+When to use this skill
+
+- Use when adding or changing business logic inside Zustand stores or when moving UI logic into testable actions.
+- Triggered by prompts about endorsement toggles, likes, and user profile updates.
+
+Instructions
+
+1. First Step: Implement pure functions for actions where possible (e.g., `addEndorsement(state, payload) => newState`).
+
+2. Second Step: Hook these functions into the store actions so they can be unit-tested separately from UI.
+
+3. Third Step: Add unit tests for each action and ensure edge cases (duplicate endorsements, idempotency) are handled.
+
+Examples
+
+- `toggleLike(paperId, userId)` checks current likes and adds/removes the user id.
+
+Notes
+
+- Keep action functions deterministic and avoid direct DOM or side-effect operations inside them; delegate I/O to services.