feat: add CSV import, activity timeline, and AI insights widget

- CSV Import: modal with file picker, auto column mapping, preview table, import progress
- Activity Timeline: new tab on client detail showing all communications, events, status changes
- AI Insights Widget: dashboard card showing stale clients, upcoming birthdays, suggested follow-ups
- Import button on Clients page header

src/pages/ClientDetailPage.tsx

@@ -2,11 +2,11 @@ import { useEffect, useState } from 'react';
 import { useParams, useNavigate, Link } from 'react-router-dom';
 import { useClientsStore } from '@/stores/clients';
 import { api } from '@/lib/api';
-import type { Event, Email } from '@/types';
+import type { Event, Email, ActivityItem } from '@/types';
 import {
   ArrowLeft, Edit3, Trash2, Phone, Mail, MapPin, Building2,
   Briefcase, Gift, Heart, Star, Users, Calendar, Send,
-  CheckCircle2, Sparkles, Clock,
+  CheckCircle2, Sparkles, Clock, Activity, FileText, UserPlus, RefreshCw,
 } from 'lucide-react';
 import { cn, formatDate, getRelativeTime, getInitials } from '@/lib/utils';
 import Badge, { EventTypeBadge, EmailStatusBadge } from '@/components/Badge';
@@ -21,7 +21,8 @@ export default function ClientDetailPage() {
   const { selectedClient, isLoading, fetchClient, updateClient, deleteClient, markContacted } = useClientsStore();
   const [events, setEvents] = useState<Event[]>([]);
   const [emails, setEmails] = useState<Email[]>([]);
-  const [activeTab, setActiveTab] = useState<'info' | 'events' | 'emails'>('info');
+  const [activities, setActivities] = useState<ActivityItem[]>([]);
+  const [activeTab, setActiveTab] = useState<'info' | 'activity' | 'events' | 'emails'>('info');
   const [showEdit, setShowEdit] = useState(false);
   const [showCompose, setShowCompose] = useState(false);
   const [deleting, setDeleting] = useState(false);
@@ -31,6 +32,7 @@ export default function ClientDetailPage() {
       fetchClient(id);
       api.getEvents({ clientId: id }).then(setEvents).catch(() => {});
       api.getEmails({ clientId: id }).then(setEmails).catch(() => {});
+      api.getClientActivity(id).then(setActivities).catch(() => {});
     }
   }, [id, fetchClient]);
 
@@ -58,8 +60,9 @@ export default function ClientDetailPage() {
     setShowEdit(false);
   };
 
-  const tabs: { key: 'info' | 'events' | 'emails'; label: string; count?: number; icon: typeof Users }[] = [
+  const tabs: { key: 'info' | 'activity' | 'events' | 'emails'; label: string; count?: number; icon: typeof Users }[] = [
     { key: 'info', label: 'Info', icon: Users },
+    { key: 'activity', label: 'Timeline', count: activities.length, icon: Activity },
     { key: 'events', label: 'Events', count: events.length, icon: Calendar },
     { key: 'emails', label: 'Emails', count: emails.length, icon: Mail },
   ];
@@ -228,6 +231,49 @@ export default function ClientDetailPage() {
         </div>
       )}
 
+      {activeTab === 'activity' && (
+        <div className="bg-white border border-slate-200 rounded-xl">
+          {activities.length === 0 ? (
+            <p className="px-5 py-8 text-center text-sm text-slate-400">No activity recorded yet</p>
+          ) : (
+            <div className="relative">
+              {activities.map((item, index) => {
+                const iconMap: Record<string, { icon: typeof Mail; color: string; bg: string }> = {
+                  email_sent: { icon: Send, color: 'text-emerald-600', bg: 'bg-emerald-100' },
+                  email_drafted: { icon: FileText, color: 'text-amber-600', bg: 'bg-amber-100' },
+                  event_created: { icon: Calendar, color: 'text-blue-600', bg: 'bg-blue-100' },
+                  client_contacted: { icon: CheckCircle2, color: 'text-emerald-600', bg: 'bg-emerald-100' },
+                  client_created: { icon: UserPlus, color: 'text-purple-600', bg: 'bg-purple-100' },
+                  client_updated: { icon: RefreshCw, color: 'text-slate-600', bg: 'bg-slate-100' },
+                };
+                const { icon: Icon, color, bg } = iconMap[item.type] || iconMap.client_updated;
+                
+                return (
+                  <div key={item.id} className="flex gap-4 px-5 py-4 relative">
+                    {/* Timeline line */}
+                    {index < activities.length - 1 && (
+                      <div className="absolute left-[2.15rem] top-14 bottom-0 w-px bg-slate-200" />
+                    )}
+                    {/* Icon */}
+                    <div className={`w-8 h-8 rounded-full flex items-center justify-center flex-shrink-0 ${bg} relative z-10`}>
+                      <Icon className={`w-4 h-4 ${color}`} />
+                    </div>
+                    {/* Content */}
+                    <div className="flex-1 min-w-0">
+                      <p className="text-sm font-medium text-slate-900">{item.title}</p>
+                      {item.description && (
+                        <p className="text-xs text-slate-500 mt-0.5 line-clamp-2">{item.description}</p>
+                      )}
+                      <p className="text-xs text-slate-400 mt-1">{formatDate(item.date)}</p>
+                    </div>
+                  </div>
+                );
+              })}
+            </div>
+          )}
+        </div>
+      )}
+
       {activeTab === 'events' && (
         <div className="bg-white border border-slate-200 rounded-xl divide-y divide-slate-100">
           {events.length === 0 ? (

src/pages/ClientsPage.tsx

@@ -1,18 +1,20 @@
 import { useEffect, useState, useMemo } from 'react';
 import { Link, useLocation } from 'react-router-dom';
 import { useClientsStore } from '@/stores/clients';
-import { Search, Plus, Users, X } from 'lucide-react';
+import { Search, Plus, Users, X, Upload } from 'lucide-react';
 import { cn, getRelativeTime, getInitials } from '@/lib/utils';
 import Badge from '@/components/Badge';
 import EmptyState from '@/components/EmptyState';
 import { PageLoader } from '@/components/LoadingSpinner';
 import Modal from '@/components/Modal';
 import ClientForm from '@/components/ClientForm';
+import CSVImportModal from '@/components/CSVImportModal';
 
 export default function ClientsPage() {
   const location = useLocation();
   const { clients, isLoading, searchQuery, selectedTag, setSearchQuery, setSelectedTag, fetchClients, createClient } = useClientsStore();
   const [showCreate, setShowCreate] = useState(false);
+  const [showImport, setShowImport] = useState(false);
   const [creating, setCreating] = useState(false);
 
   useEffect(() => {
@@ -72,13 +74,22 @@ export default function ClientsPage() {
           <h1 className="text-2xl font-bold text-slate-900">Clients</h1>
           <p className="text-slate-500 text-sm mt-1">{clients.length} contacts in your network</p>
         </div>
-        <button
-          onClick={() => setShowCreate(true)}
-          className="flex items-center gap-2 px-4 py-2 bg-blue-600 text-white rounded-lg text-sm font-medium hover:bg-blue-700 transition-colors"
-        >
-          <Plus className="w-4 h-4" />
-          Add Client
-        </button>
+        <div className="flex items-center gap-2">
+          <button
+            onClick={() => setShowImport(true)}
+            className="flex items-center gap-2 px-4 py-2 bg-white border border-slate-200 text-slate-700 rounded-lg text-sm font-medium hover:bg-slate-50 transition-colors"
+          >
+            <Upload className="w-4 h-4" />
+            Import CSV
+          </button>
+          <button
+            onClick={() => setShowCreate(true)}
+            className="flex items-center gap-2 px-4 py-2 bg-blue-600 text-white rounded-lg text-sm font-medium hover:bg-blue-700 transition-colors"
+          >
+            <Plus className="w-4 h-4" />
+            Add Client
+          </button>
+        </div>
       </div>
 
       {/* Search + Tags */}
@@ -175,6 +186,13 @@ export default function ClientsPage() {
       <Modal isOpen={showCreate} onClose={() => setShowCreate(false)} title="Add Client" size="lg">
         <ClientForm onSubmit={handleCreate} loading={creating} />
       </Modal>
+
+      {/* Import CSV Modal */}
+      <CSVImportModal
+        isOpen={showImport}
+        onClose={() => setShowImport(false)}
+        onComplete={() => fetchClients()}
+      />
     </div>
   );
 }

src/pages/DashboardPage.tsx

@@ -1,8 +1,8 @@
 import { useEffect, useState } from 'react';
 import { Link } from 'react-router-dom';
 import { api } from '@/lib/api';
-import type { Client, Event, Email } from '@/types';
-import { Users, Calendar, Mail, Plus, ArrowRight, Gift, Heart, Clock } from 'lucide-react';
+import type { Client, Event, Email, InsightsData } from '@/types';
+import { Users, Calendar, Mail, Plus, ArrowRight, Gift, Heart, Clock, AlertTriangle, Sparkles, UserCheck, PhoneForwarded } from 'lucide-react';
 import { formatDate, getDaysUntil } from '@/lib/utils';
 import { EventTypeBadge } from '@/components/Badge';
 import { PageLoader } from '@/components/LoadingSpinner';
@@ -11,6 +11,7 @@ export default function DashboardPage() {
   const [clients, setClients] = useState<Client[]>([]);
   const [events, setEvents] = useState<Event[]>([]);
   const [emails, setEmails] = useState<Email[]>([]);
+  const [insights, setInsights] = useState<InsightsData | null>(null);
   const [loading, setLoading] = useState(true);
 
   useEffect(() => {
@@ -18,10 +19,12 @@ export default function DashboardPage() {
       api.getClients().catch(() => []),
       api.getEvents({ upcoming: 7 }).catch(() => []),
       api.getEmails({ status: 'draft' }).catch(() => []),
-    ]).then(([c, e, em]) => {
+      api.getInsights().catch(() => null),
+    ]).then(([c, e, em, ins]) => {
       setClients(c);
       setEvents(e);
       setEmails(em);
+      setInsights(ins as InsightsData | null);
       setLoading(false);
     });
   }, []);
@@ -78,6 +81,111 @@ export default function DashboardPage() {
         ))}
       </div>
 
+      {/* AI Insights */}
+      {insights && (insights.staleClients.length > 0 || insights.upcomingBirthdays.length > 0 || insights.suggestedFollowups.length > 0) && (
+        <div className="bg-gradient-to-br from-indigo-50 to-purple-50 border border-indigo-200 rounded-xl p-5 space-y-4">
+          <div className="flex items-center gap-2">
+            <Sparkles className="w-5 h-5 text-indigo-600" />
+            <h2 className="font-semibold text-indigo-900">AI Insights</h2>
+          </div>
+
+          <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
+            {/* Needs Attention */}
+            {insights.staleClients.length > 0 && (
+              <div className="bg-white/80 rounded-lg p-4 space-y-3">
+                <div className="flex items-center gap-2 text-sm font-medium text-red-700">
+                  <AlertTriangle className="w-4 h-4" />
+                  Needs Attention
+                </div>
+                <p className="text-xs text-slate-500">
+                  {insights.summary.staleCount} client{insights.summary.staleCount !== 1 ? 's' : ''} not contacted in 30+ days
+                  {insights.summary.neverContacted > 0 && `, ${insights.summary.neverContacted} never contacted`}
+                </p>
+                <div className="space-y-2">
+                  {insights.staleClients.slice(0, 3).map(c => (
+                    <Link key={c.id} to={`/clients/${c.id}`} className="flex items-center gap-2 group">
+                      <div className="w-6 h-6 bg-red-100 text-red-700 rounded-full flex items-center justify-center text-xs font-bold flex-shrink-0">
+                        {c.firstName[0]}{c.lastName[0]}
+                      </div>
+                      <div className="min-w-0">
+                        <p className="text-xs font-medium text-slate-700 truncate group-hover:text-blue-600">
+                          {c.firstName} {c.lastName}
+                        </p>
+                        <p className="text-xs text-slate-400">
+                          {c.daysSinceContact ? `${c.daysSinceContact}d ago` : 'Never contacted'}
+                        </p>
+                      </div>
+                    </Link>
+                  ))}
+                  {insights.staleClients.length > 3 && (
+                    <Link to="/clients" className="text-xs text-indigo-600 hover:text-indigo-700">
+                      +{insights.staleClients.length - 3} more
+                    </Link>
+                  )}
+                </div>
+              </div>
+            )}
+
+            {/* Upcoming Birthdays */}
+            {insights.upcomingBirthdays.length > 0 && (
+              <div className="bg-white/80 rounded-lg p-4 space-y-3">
+                <div className="flex items-center gap-2 text-sm font-medium text-pink-700">
+                  <Gift className="w-4 h-4" />
+                  Birthdays This Week
+                </div>
+                <div className="space-y-2">
+                  {insights.upcomingBirthdays.map(c => (
+                    <Link key={c.id} to={`/clients/${c.id}`} className="flex items-center gap-2 group">
+                      <div className="w-6 h-6 bg-pink-100 text-pink-700 rounded-full flex items-center justify-center text-xs font-bold flex-shrink-0">
+                        🎂
+                      </div>
+                      <div className="min-w-0">
+                        <p className="text-xs font-medium text-slate-700 truncate group-hover:text-blue-600">
+                          {c.firstName} {c.lastName}
+                        </p>
+                        <p className="text-xs text-slate-400">
+                          {c.daysUntil === 0 ? 'Today!' : c.daysUntil === 1 ? 'Tomorrow' : `In ${c.daysUntil} days`}
+                        </p>
+                      </div>
+                    </Link>
+                  ))}
+                </div>
+              </div>
+            )}
+
+            {/* Suggested Follow-ups */}
+            {insights.suggestedFollowups.length > 0 && (
+              <div className="bg-white/80 rounded-lg p-4 space-y-3">
+                <div className="flex items-center gap-2 text-sm font-medium text-amber-700">
+                  <PhoneForwarded className="w-4 h-4" />
+                  Suggested Follow-ups
+                </div>
+                <p className="text-xs text-slate-500">
+                  Contacted 14-30 days ago — good time to reach out
+                </p>
+                <div className="space-y-2">
+                  {insights.suggestedFollowups.slice(0, 3).map(c => (
+                    <Link key={c.id} to={`/clients/${c.id}`} className="flex items-center gap-2 group">
+                      <div className="w-6 h-6 bg-amber-100 text-amber-700 rounded-full flex items-center justify-center text-xs font-bold flex-shrink-0">
+                        {c.firstName[0]}{c.lastName[0]}
+                      </div>
+                      <div className="min-w-0">
+                        <p className="text-xs font-medium text-slate-700 truncate group-hover:text-blue-600">
+                          {c.firstName} {c.lastName}
+                        </p>
+                        <p className="text-xs text-slate-400">
+                          {c.daysSinceContact}d since last contact
+                        </p>
+                      </div>
+                    </Link>
+                  ))}
+                </div>
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+
       <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
         {/* Upcoming Events */}
         <div className="bg-white border border-slate-200 rounded-xl">