Fix reconciliation page errors by correcting React hook usage

Resolve React Error #310 in the reconciliation page by ensuring proper imports and usage of React hooks like useState and useEffect.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: b163d4c0-de5e-4f4e-a9c0-aed4c7049718
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/b163d4c0-de5e-4f4e-a9c0-aed4c7049718/7zljVXI

client/src/hooks/use-mobile.tsx

@@ -1,11 +1,11 @@
-import * as React from "react"
+import { useState, useEffect } from "react"
 
 const MOBILE_BREAKPOINT = 768
 
 export function useIsMobile() {
-  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+  const [isMobile, setIsMobile] = useState<boolean | undefined>(undefined)
 
-  React.useEffect(() => {
+  useEffect(() => {
     const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
     const onChange = () => {
       setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)