feat: add expandable sidebar navigation to settings page

Replace direct SharedProfileSettings rendering with an expandable sidebar
that shows Profile, Security, and Preferences as collapsible sub-items
under Profile & Preferences. Matches the new settings pattern across
all Ciphera frontends.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/settings/SettingsPageClient.tsx

@@ -0,0 +1,150 @@
+'use client'
+
+import { useState } from 'react'
+import ProfileSettings from '@/components/settings/ProfileSettings'
+import { motion, AnimatePresence } from 'framer-motion'
+import {
+  UserIcon,
+  ChevronDownIcon,
+} from '@ciphera-net/ui'
+
+type ProfileSubTab = 'profile' | 'security' | 'preferences'
+
+function SectionHeader({
+  expanded,
+  active,
+  onToggle,
+  icon: Icon,
+  label,
+  description,
+}: {
+  expanded: boolean
+  active: boolean
+  onToggle: () => void
+  icon: React.ElementType
+  label: string
+  description?: string
+}) {
+  return (
+    <button
+      onClick={onToggle}
+      className={`w-full flex items-start gap-3 px-4 py-3 text-left rounded-xl transition-all duration-200 ${
+        active
+          ? 'bg-brand-orange/10 text-brand-orange'
+          : 'text-neutral-600 dark:text-neutral-400 hover:bg-neutral-100 dark:hover:bg-neutral-800'
+      }`}
+    >
+      <Icon className="w-5 h-5 mt-0.5 shrink-0" />
+      <div className="flex-1 min-w-0">
+        <span className="font-medium">{label}</span>
+        {description && (
+          <p className={`text-xs mt-0.5 ${active ? 'text-brand-orange/70' : 'text-neutral-500'}`}>
+            {description}
+          </p>
+        )}
+      </div>
+      <ChevronDownIcon
+        className={`w-4 h-4 shrink-0 mt-1 transition-transform duration-200 ${
+          expanded ? '' : '-rotate-90'
+        }`}
+      />
+    </button>
+  )
+}
+
+function SubItem({
+  active,
+  onClick,
+  label,
+}: {
+  active: boolean
+  onClick: () => void
+  label: string
+}) {
+  return (
+    <button
+      onClick={onClick}
+      className={`w-full flex items-center gap-2.5 pl-12 pr-4 py-2 text-sm text-left rounded-lg transition-all duration-150 ${
+        active
+          ? 'text-brand-orange font-medium bg-brand-orange/5'
+          : 'text-neutral-500 dark:text-neutral-400 hover:text-neutral-900 dark:hover:text-white hover:bg-neutral-50 dark:hover:bg-neutral-800/50'
+      }`}
+    >
+      <span className="flex-1">{label}</span>
+    </button>
+  )
+}
+
+function ExpandableSubItems({ expanded, children }: { expanded: boolean; children: React.ReactNode }) {
+  return (
+    <AnimatePresence initial={false}>
+      {expanded && (
+        <motion.div
+          initial={{ height: 0, opacity: 0 }}
+          animate={{ height: 'auto', opacity: 1 }}
+          exit={{ height: 0, opacity: 0 }}
+          transition={{ duration: 0.2, ease: 'easeInOut' }}
+          className="overflow-hidden"
+        >
+          <div className="py-1 space-y-0.5">
+            {children}
+          </div>
+        </motion.div>
+      )}
+    </AnimatePresence>
+  )
+}
+
+export default function SettingsPageClient() {
+  const [activeSubTab, setActiveSubTab] = useState<ProfileSubTab>('profile')
+  const [expanded, setExpanded] = useState(true)
+
+  return (
+    <div className="space-y-8">
+      <div>
+        <h1 className="text-3xl font-bold text-neutral-900 dark:text-white">Settings</h1>
+        <p className="mt-2 text-neutral-600 dark:text-neutral-400">
+          Manage your account settings and preferences.
+        </p>
+      </div>
+
+      <div className="flex flex-col lg:flex-row gap-8">
+        {/* Sidebar Navigation */}
+        <nav className="w-full lg:w-72 flex-shrink-0">
+          <div>
+            <SectionHeader
+              expanded={expanded}
+              active={true}
+              onToggle={() => setExpanded(!expanded)}
+              icon={UserIcon}
+              label="Profile & Preferences"
+              description="Your profile and sharing defaults"
+            />
+            <ExpandableSubItems expanded={expanded}>
+              <SubItem
+                active={activeSubTab === 'profile'}
+                onClick={() => setActiveSubTab('profile')}
+                label="Profile"
+              />
+              <SubItem
+                active={activeSubTab === 'security'}
+                onClick={() => setActiveSubTab('security')}
+                label="Security"
+              />
+              <SubItem
+                active={activeSubTab === 'preferences'}
+                onClick={() => setActiveSubTab('preferences')}
+                label="Preferences"
+              />
+            </ExpandableSubItems>
+          </div>
+        </nav>
+
+        {/* Content Area */}
+        <div className="flex-1 min-w-0">
+          <ProfileSettings activeTab={activeSubTab} />
+        </div>
+      </div>
+    </div>
+  )
+}

app/settings/page.tsx

@@ -1,4 +1,4 @@
-import ProfileSettings from '@/components/settings/ProfileSettings'
+import SettingsPageClient from './SettingsPageClient'
 
 export const metadata = {
   title: 'Settings - Pulse',
@@ -8,7 +8,7 @@ export const metadata = {
 export default function SettingsPage() {
   return (
     <div className="w-full max-w-6xl mx-auto px-4 sm:px-6 py-8">
-      <ProfileSettings />
+      <SettingsPageClient />
     </div>
   )
 }

components/settings/ProfileSettings.tsx

@@ -8,7 +8,11 @@ import { deleteAccount, getUserSessions, revokeSession, updateUserPreferences, u
 import { setup2FA, verify2FA, disable2FA, regenerateRecoveryCodes } from '@/lib/api/2fa'
 import { registerPasskey, listPasskeys, deletePasskey } from '@/lib/api/webauthn'
 
-export default function ProfileSettings() {
+interface Props {
+  activeTab?: 'profile' | 'security' | 'preferences'
+}
+
+export default function ProfileSettings({ activeTab }: Props = {}) {
   const { user, refresh, logout } = useAuth()
 
   if (!user) return null
@@ -54,6 +58,8 @@ export default function ProfileSettings() {
       deriveAuthKey={deriveAuthKey}
       refreshUser={refresh}
       logout={logout}
+      activeTab={activeTab}
+      hideNav={activeTab !== undefined}
     />
   )
 }

package.json

@@ -10,7 +10,7 @@
     "type-check": "tsc --noEmit"
   },
   "dependencies": {
-    "@ciphera-net/ui": "^0.0.74",
+    "@ciphera-net/ui": "^0.0.75",
     "@ducanh2912/next-pwa": "^10.2.9",
     "@radix-ui/react-icons": "^1.3.0",
     "@simplewebauthn/browser": "^13.2.2",