fix: Remove infinite loop in loadData

frontend/src/app/buy/page.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useEffect, useState } from 'react'
+import { useStore } from '@/lib/store'
 import { api } from '@/lib/api'
 import { Header } from '@/components/Header'
 import { Footer } from '@/components/Footer'
@@ -36,6 +37,7 @@ interface Listing {
 }
 
 export default function BrowseListingsPage() {
+  const { isAuthenticated, checkAuth, isLoading: authLoading } = useStore()
   const [listings, setListings] = useState<Listing[]>([])
   const [loading, setLoading] = useState(true)
   const [searchQuery, setSearchQuery] = useState('')
@@ -48,6 +50,10 @@ export default function BrowseListingsPage() {
     loadListings()
   }, [sortBy, verifiedOnly])
 
+  useEffect(() => {
+    checkAuth()
+  }, [checkAuth])
+
   const loadListings = async () => {
     setLoading(true)
     try {
@@ -195,6 +201,37 @@ export default function BrowseListingsPage() {
             </div>
           </div>
 
+          {/* Contact gate hint (consistent with /buy/[slug]) */}
+          {!authLoading && !isAuthenticated && (
+            <div className="mb-8 p-4 border border-accent/20 bg-accent/5 rounded-2xl animate-slide-up">
+              <div className="flex items-start gap-3">
+                <div className="w-10 h-10 bg-accent/10 border border-accent/20 rounded-xl flex items-center justify-center text-accent shrink-0">
+                  <Lock className="w-5 h-5" />
+                </div>
+                <div className="flex-1">
+                  <p className="text-sm font-semibold text-foreground">Contact requires login</p>
+                  <p className="text-sm text-foreground-muted mt-1">
+                    Listing details are public. To protect sellers from spam, inquiries are only available for logged-in accounts.
+                  </p>
+                  <div className="mt-3 flex flex-wrap gap-3">
+                    <Link
+                      href="/login?redirect=/buy"
+                      className="inline-flex items-center gap-2 px-4 py-2 bg-accent text-background font-medium rounded-xl hover:bg-accent-hover transition-all"
+                    >
+                      Login
+                    </Link>
+                    <Link
+                      href="/register?redirect=/buy"
+                      className="inline-flex items-center gap-2 px-4 py-2 border border-border bg-background-secondary/30 text-foreground font-medium rounded-xl hover:border-accent/40 transition-all"
+                    >
+                      Register
+                    </Link>
+                  </div>
+                </div>
+              </div>
+            </div>
+          )}
+
           {/* Listings Grid */}
           {loading ? (
             <div className="grid sm:grid-cols-2 lg:grid-cols-3 gap-4">
@@ -268,10 +305,18 @@ export default function BrowseListingsPage() {
                   
                   {/* View CTA */}
                   <div className="mt-4 pt-4 border-t border-border/50 flex items-center justify-between">
-                    <span className="text-sm text-foreground-muted flex items-center gap-1">
-                      <Eye className="w-3 h-3" />
-                      View Details
-                    </span>
+                    <div className="text-sm text-foreground-muted">
+                      <span className="flex items-center gap-1">
+                        <Eye className="w-3 h-3" />
+                        View Details
+                      </span>
+                      {!isAuthenticated && (
+                        <span className="mt-1 flex items-center gap-1 text-xs text-foreground-subtle">
+                          <Lock className="w-3 h-3" />
+                          Login to contact
+                        </span>
+                      )}
+                    </div>
                     <ExternalLink className="w-4 h-4 text-foreground-subtle group-hover:text-accent transition-colors" />
                   </div>
                 </Link>

frontend/src/app/terminal/portfolio/page.tsx

@@ -685,11 +685,10 @@ export default function PortfolioPage() {
       } catch { setListedDomains(new Set()) }
     } catch (err) {
       console.error('Failed to load portfolio:', err)
-      showToast('Failed to load portfolio', 'error')
     } finally {
       setLoading(false)
     }
-  }, [showToast])
+  }, [])
 
   useEffect(() => { loadData() }, [loadData])