refactor: move setLoading(true) before GitHub import loop

Was called per-iteration inside try block. Only needs to be set
once before the loop starts.

Author: DevanshuNEU

frontend/src/components/dashboard/DashboardHome.tsx

@@ -109,10 +109,10 @@ export function DashboardHome() {
 
     let lastSuccessId: string | null = null
     let lastSuccessName = ''
+    setLoading(true)
 
     for (const repo of githubRepos) {
       try {
-        setLoading(true)
         const repoId = await addAndIndex(repo.name, repo.clone_url, repo.default_branch)
 
         if (repoId) {