feat(auth,explore): Add NSFW content gating and age verification

- Add automatic NSFW settings for users registering on NSFW nodes
- Implement age verification checkbox on registration form for NSFW nodes
- Add NSFW node detection on explore page with gated content access
- Restrict unauthenticated users from viewing posts on NSFW nodes
- Fetch and display node NSFW status in explore and login pages
- Update node info type to include isNsfw flag across auth flows
- Display age-gated content warning with EyeOff icon for restricted access
- Enforce age verification requirement before registration on adult nodes

src/app/api/auth/register/route.ts

@@ -1,5 +1,7 @@
 import { NextResponse } from 'next/server';
 import { registerUser, createSession } from '@/lib/auth';
+import { db, nodes, users } from '@/db';
+import { eq } from 'drizzle-orm';
 import { z } from 'zod';
 
 const registerSchema = z.object({
@@ -21,6 +23,22 @@ export async function POST(request: Request) {
             data.displayName
         );
 
+        // Check if this is an NSFW node and auto-enable NSFW settings
+        const nodeDomain = process.env.NEXT_PUBLIC_NODE_DOMAIN || 'localhost:3000';
+        const node = await db.query.nodes.findFirst({
+            where: eq(nodes.domain, nodeDomain),
+        });
+
+        if (node?.isNsfw) {
+            // Auto-enable NSFW viewing and mark account as NSFW for users on NSFW nodes
+            await db.update(users)
+                .set({ 
+                    nsfwEnabled: true,
+                    isNsfw: true 
+                })
+                .where(eq(users.id, user.id));
+        }
+
         // Create session for new user
         await createSession(user.id);
 

src/app/explore/page.tsx

@@ -6,7 +6,8 @@ import { SearchIcon, TrendingIcon, UsersIcon } from '@/components/Icons';
 import { PostCard } from '@/components/PostCard';
 import { Post } from '@/lib/types';
 import { formatFullHandle } from '@/lib/utils/handle';
-import { Bot, Network, Server } from 'lucide-react';
+import { Bot, Network, Server, EyeOff } from 'lucide-react';
+import { useAuth } from '@/lib/contexts/AuthContext';
 
 interface User {
     id: string;
@@ -75,6 +76,7 @@ interface SwarmPost {
 }
 
 export default function ExplorePage() {
+    const { user } = useAuth();
     const [query, setQuery] = useState('');
     const [activeTab, setActiveTab] = useState<'node' | 'swarm' | 'users' | 'search'>('node');
     const [nodePosts, setNodePosts] = useState<Post[]>([]);
@@ -84,6 +86,17 @@ export default function ExplorePage() {
     const [searchResults, setSearchResults] = useState<{ posts: Post[]; users: User[] }>({ posts: [], users: [] });
     const [loading, setLoading] = useState(true);
     const [searching, setSearching] = useState(false);
+    const [isNsfwNode, setIsNsfwNode] = useState(false);
+
+    // Fetch node info to check if NSFW
+    useEffect(() => {
+        fetch('/api/node')
+            .then(res => res.json())
+            .then(data => {
+                setIsNsfwNode(data.isNsfw || false);
+            })
+            .catch(() => {});
+    }, []);
 
     useEffect(() => {
         // Load node posts (local only)
@@ -232,7 +245,17 @@ export default function ExplorePage() {
 
             <div className="explore-content">
                 {activeTab === 'node' && (
-                    loading ? (
+                    !user && isNsfwNode ? (
+                        <div style={{ padding: '48px', textAlign: 'center', color: 'var(--foreground-tertiary)', display: 'flex', flexDirection: 'column', alignItems: 'center' }}>
+                            <EyeOff size={48} style={{ marginBottom: '16px', opacity: 0.5 }} />
+                            <p style={{ fontSize: '16px', fontWeight: 500, color: 'var(--foreground-secondary)', marginBottom: '8px' }}>
+                                Adult Content
+                            </p>
+                            <p style={{ fontSize: '14px', maxWidth: '320px', margin: '0 auto' }}>
+                                This node contains adult or sensitive content. You must be 18 or older and signed in to view posts.
+                            </p>
+                        </div>
+                    ) : loading ? (
                         <div className="explore-loading">Loading posts...</div>
                     ) : nodePosts.length === 0 ? (
                         <div className="explore-empty">

src/app/login/page.tsx

@@ -15,8 +15,9 @@ export default function LoginPage() {
     const [error, setError] = useState('');
     const [loading, setLoading] = useState(false);
     const [nodeInfoLoaded, setNodeInfoLoaded] = useState(false);
-    const [nodeInfo, setNodeInfo] = useState<{ name: string; description: string; logoUrl?: string }>({ name: '', description: '' });
+    const [nodeInfo, setNodeInfo] = useState<{ name: string; description: string; logoUrl?: string; isNsfw?: boolean }>({ name: '', description: '' });
     const [handleStatus, setHandleStatus] = useState<'idle' | 'checking' | 'available' | 'taken'>('idle');
+    const [ageVerified, setAgeVerified] = useState(false);
 
     // Import specific state
     const [importFile, setImportFile] = useState<File | null>(null);
@@ -33,7 +34,8 @@ export default function LoginPage() {
                 setNodeInfo({
                     name: data.name || '',
                     description: data.description || 'Synapsis is designed to function like a global signal layer rather than a culture-bound platform. Anyone can run their own node and still participate in a shared, interconnected network, with global identity, clean terminology, and a modern interface that feels current rather than experimental. Synapsis aims to be neutral, resilient infrastructure for human and machine discourse, more like a protocol or nervous system than a social club.',
-                    logoUrl: data.logoUrl || undefined
+                    logoUrl: data.logoUrl || undefined,
+                    isNsfw: data.isNsfw || false
                 });
                 setNodeInfoLoaded(true);
             })
@@ -122,6 +124,11 @@ export default function LoginPage() {
             return;
         }
 
+        if (mode === 'register' && nodeInfo.isNsfw && !ageVerified) {
+            setError('You must verify your age to register on this node');
+            return;
+        }
+
         setLoading(true);
 
         try {
@@ -380,6 +387,30 @@ export default function LoginPage() {
                             </div>
                         )}
 
+                        {mode === 'register' && nodeInfo.isNsfw && (
+                            <div style={{
+                                marginBottom: '20px',
+                                padding: '12px',
+                                background: 'rgba(239, 68, 68, 0.05)',
+                                border: '1px solid rgba(239, 68, 68, 0.2)',
+                                borderRadius: 'var(--radius-md)',
+                            }}>
+                                <label style={{ display: 'flex', gap: '8px', cursor: 'pointer' }}>
+                                    <input
+                                        type="checkbox"
+                                        checked={ageVerified}
+                                        onChange={(e) => setAgeVerified(e.target.checked)}
+                                        style={{ marginTop: '3px' }}
+                                    />
+                                    <span style={{ fontSize: '12px', color: 'var(--foreground-secondary)', lineHeight: 1.4 }}>
+                                        <strong style={{ color: 'var(--error)', display: 'inline-flex', alignItems: 'center', gap: '4px' }}>
+                                            <TriangleAlert size={12} /> Age Verification:
+                                        </strong> This node contains adult or sensitive content. I confirm that I am at least 18 years of age.
+                                    </span>
+                                </label>
+                            </div>
+                        )}
+
                         <button
                             type="submit"
                             className="btn btn-primary btn-lg"

src/app/page.tsx

@@ -159,17 +159,14 @@ export default function Home() {
 
       {/* NSFW node gate for unauthenticated users */}
       {!user && isNsfwNode ? (
-        <div style={{ padding: '48px', textAlign: 'center', color: 'var(--foreground-tertiary)' }}>
+        <div style={{ padding: '48px', textAlign: 'center', color: 'var(--foreground-tertiary)', display: 'flex', flexDirection: 'column', alignItems: 'center' }}>
           <EyeOff size={48} style={{ marginBottom: '16px', opacity: 0.5 }} />
           <p style={{ fontSize: '16px', fontWeight: 500, color: 'var(--foreground-secondary)', marginBottom: '8px' }}>
             Adult Content
           </p>
-          <p style={{ fontSize: '14px', maxWidth: '320px', margin: '0 auto 20px' }}>
+          <p style={{ fontSize: '14px', maxWidth: '320px', margin: '0 auto' }}>
             This node contains adult or sensitive content. You must be 18 or older and signed in to view posts.
           </p>
-          <Link href="/login" className="btn btn-primary">
-            Sign In to Continue
-          </Link>
         </div>
       ) : loading ? (
         <div style={{ padding: '48px', textAlign: 'center', color: 'var(--foreground-tertiary)' }}>