Refactor UI imports and update component paths

Replaces imports from 'components/ui' with 'components/common' across the app and dashboard pages, and updates model and API imports to use new paths under 'lib'. Removes redundant authentication checks from several dashboard pages. Adds new dashboard components and utility files, and reorganizes hooks and services into the 'lib' directory for improved structure.

lib/hooks/useUser.ts

@@ -0,0 +1,50 @@
+"use client"
+
+import { useState, useEffect } from 'react'
+import { clientFetch } from '@/lib/api/api-client'
+
+interface Vendor {
+  _id: string;
+  username: string;
+  storeId: string;
+  pgpKey: string;
+  __v: number;
+}
+
+interface User {
+  vendor: Vendor;
+}
+
+export function useUser() {
+  const [user, setUser] = useState<User | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+
+  useEffect(() => {
+    const fetchUser = async () => {
+      try {
+        setLoading(true)
+        const userData = await clientFetch<User>("/auth/me")
+        setUser(userData)
+        setError(null)
+      } catch (err) {
+        console.error("Failed to fetch user:", err)
+        setError("Failed to fetch user data")
+        setUser(null)
+      } finally {
+        setLoading(false)
+      }
+    }
+
+    fetchUser()
+  }, [])
+
+  const isAdmin = user?.vendor?.username === 'admin1'
+
+  return {
+    user,
+    loading,
+    error,
+    isAdmin
+  }
+}