Initial scaffold: Researcher Endorsement frontend

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

src/store/useAppStore.ts

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+import create from 'zustand'
+import { User } from '../types/User'
+import { Post } from '../types/Post'
+import { seedUsers, seedPosts } from '../mock/seedData'
+
+type UIState = { isCreatePostOpen: boolean }
+
+type AppState = {
+  users: User[]
+  posts: Post[]
+  currentUserId: string | null
+  selectedPostId: string | null
+  ui: UIState
+  seedData: () => void
+  createUser: (data: { name: string; email: string; bio: string; specialties: string[] }) => User
+  setCurrentUser: (id: string | null) => void
+  createPost: (data: { authorId: string; content: string; attachedPDF?: { name: string; url: string } }) => Post
+  endorseUser: (userId: string, specialty: string) => void
+  endorsePost: (postId: string) => void
+  attachPDFToPost: (postId: string, file: File) => void
+  toggleCreatePost: () => void
+}
+
+const makeId = () => (typeof crypto !== 'undefined' && 'randomUUID' in crypto ? (crypto as any).randomUUID() : 'id-' + Date.now())
+
+const useAppStore = create<AppState>((set, get) => ({
+  users: [],
+  posts: [],
+  currentUserId: null,
+  selectedPostId: null,
+  ui: { isCreatePostOpen: false },
+
+  seedData: () => {
+    const users = seedUsers()
+    const posts = seedPosts(users)
+    set(() => ({ users, posts }))
+  },
+
+  createUser: (data) => {
+    const id = makeId()
+    const newUser: User = {
+      id,
+      name: data.name,
+      email: data.email,
+      bio: data.bio,
+      specialties: data.specialties,
+      endorsements: {},
+      createdAt: Date.now(),
+    }
+    set((state) => ({ users: [newUser, ...state.users], currentUserId: id }))
+    return newUser
+  },
+
+  setCurrentUser: (id) => set(() => ({ currentUserId: id })),
+
+  createPost: (data) => {
+    const id = makeId()
+    const newPost: Post = {
+      id,
+      authorId: data.authorId,
+      content: data.content,
+      attachedPDF: data.attachedPDF,
+      endorsements: 0,
+      createdAt: Date.now(),
+    }
+    set((state) => ({ posts: [newPost, ...state.posts] }))
+    return newPost
+  },
+
+  endorseUser: (userId, specialty) => {
+    set((state) => ({
+      users: state.users.map((u) => {
+        if (u.id !== userId) return u
+        const current = { ...u.endorsements }
+        current[specialty] = (current[specialty] || 0) + 1
+        return { ...u, endorsements: current }
+      }),
+    }))
+  },
+
+  endorsePost: (postId) => {
+    set((state) => ({
+      posts: state.posts.map((p) => (p.id === postId ? { ...p, endorsements: p.endorsements + 1 } : p)),
+    }))
+  },
+
+  attachPDFToPost: (postId, file) => {
+    const url = URL.createObjectURL(file)
+    set((state) => ({
+      posts: state.posts.map((p) => (p.id === postId ? { ...p, attachedPDF: { name: file.name, url } } : p)),
+    }))
+  },
+
+  toggleCreatePost: () => set((state) => ({ ui: { isCreatePostOpen: !state.ui.isCreatePostOpen } })),
+}))
+
+export default useAppStore