Add encrypted key support for chat and nodes

Introduces encrypted private key storage for nodes and users, updates chat message schema to support sender-side encryption, and adds supporting libraries and tests for cryptographic signing and identity unlock flows. Includes new database migrations, API route updates, and React components for identity unlock prompts.

src/components/Sidebar.tsx

@@ -7,16 +7,18 @@ import { usePathname, useRouter } from 'next/navigation';
 import { useAuth } from '@/lib/contexts/AuthContext';
 import { HomeIcon, SearchIcon, BellIcon, UserIcon, ShieldIcon, SettingsIcon, BotIcon } from './Icons';
 import { formatFullHandle } from '@/lib/utils/handle';
-import { LogOut, Settings2 } from 'lucide-react';
+import { LogOut, Settings2, Lock, Unlock } from 'lucide-react';
+import { IdentityUnlockPrompt } from './IdentityUnlockPrompt';
 
 export function Sidebar() {
-    const { user, isAdmin } = useAuth();
+    const { user, isAdmin, logout, isIdentityUnlocked } = useAuth();
     const pathname = usePathname();
     const router = useRouter();
     const [customLogoUrl, setCustomLogoUrl] = useState<string | null | undefined>(undefined);
     const [unreadCount, setUnreadCount] = useState(0);
     const [unreadChatCount, setUnreadChatCount] = useState(0);
     const [loggingOut, setLoggingOut] = useState(false);
+    const [showUnlockPrompt, setShowUnlockPrompt] = useState(false);
 
     useEffect(() => {
         fetch('/api/node')
@@ -75,7 +77,7 @@ export function Sidebar() {
 
         setLoggingOut(true);
         try {
-            await fetch('/api/auth/logout', { method: 'POST' });
+            await logout();
             window.location.href = '/explore';
         } catch (error) {
             console.error('Logout failed:', error);
@@ -188,6 +190,72 @@ export function Sidebar() {
                             <div style={{ color: 'var(--foreground-tertiary)', fontSize: '13px', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{formatFullHandle(user.handle)}</div>
                         </div>
                     </div>
+                    
+                    {/* Identity Status Indicator */}
+                    <div
+                        onClick={() => {
+                            if (!isIdentityUnlocked) {
+                                setShowUnlockPrompt(true);
+                            }
+                        }}
+                        title={isIdentityUnlocked ? 'Identity unlocked - you can perform actions' : 'Identity locked - click to unlock'}
+                        style={{
+                            display: 'flex',
+                            alignItems: 'center',
+                            gap: '8px',
+                            padding: '10px 12px',
+                            marginBottom: '12px',
+                            borderRadius: '8px',
+                            background: isIdentityUnlocked 
+                                ? 'rgba(34, 197, 94, 0.1)' 
+                                : 'rgba(251, 191, 36, 0.1)',
+                            border: isIdentityUnlocked
+                                ? '1px solid rgba(34, 197, 94, 0.2)'
+                                : '1px solid rgba(251, 191, 36, 0.2)',
+                            cursor: isIdentityUnlocked ? 'default' : 'pointer',
+                            transition: 'all 0.2s',
+                        }}
+                        onMouseEnter={(e) => {
+                            if (!isIdentityUnlocked) {
+                                e.currentTarget.style.background = 'rgba(251, 191, 36, 0.15)';
+                            }
+                        }}
+                        onMouseLeave={(e) => {
+                            if (!isIdentityUnlocked) {
+                                e.currentTarget.style.background = 'rgba(251, 191, 36, 0.1)';
+                            }
+                        }}
+                    >
+                        {isIdentityUnlocked ? (
+                            <Unlock size={16} style={{ color: 'rgb(34, 197, 94)', flexShrink: 0 }} />
+                        ) : (
+                            <Lock size={16} style={{ color: 'rgb(251, 191, 36)', flexShrink: 0 }} />
+                        )}
+                        <div style={{ flex: 1, minWidth: 0 }}>
+                            <div style={{ 
+                                fontSize: '13px', 
+                                fontWeight: 500,
+                                color: isIdentityUnlocked ? 'rgb(34, 197, 94)' : 'rgb(251, 191, 36)',
+                                overflow: 'hidden',
+                                textOverflow: 'ellipsis',
+                                whiteSpace: 'nowrap'
+                            }}>
+                                {isIdentityUnlocked ? 'Identity Unlocked' : 'Identity Locked'}
+                            </div>
+                            <div style={{ 
+                                fontSize: '11px', 
+                                color: 'var(--foreground-tertiary)',
+                                overflow: 'hidden',
+                                textOverflow: 'ellipsis',
+                                whiteSpace: 'nowrap'
+                            }}>
+                                {isIdentityUnlocked 
+                                    ? 'You can perform actions' 
+                                    : 'Click to unlock'}
+                            </div>
+                        </div>
+                    </div>
+                    
                     <button
                         onClick={handleLogout}
                         disabled={loggingOut}
@@ -205,6 +273,14 @@ export function Sidebar() {
                     </button>
                 </div>
             )}
+            
+            {/* Identity Unlock Prompt Modal */}
+            {showUnlockPrompt && (
+                <IdentityUnlockPrompt
+                    onUnlock={() => setShowUnlockPrompt(false)}
+                    onCancel={() => setShowUnlockPrompt(false)}
+                />
+            )}
         </aside>
     );
 }