Implement Phase 2 features for Campaign Command Center

Adds 14 new features across the dashboard:
- Deal Risk Scoring (0-100) with risk factors on pipeline deals
- Account Health Score with multi-factor analysis on account cards
- Next Best Action Engine on Executive Overview
- Account Notes with pin/edit/delete in activity overlay and account detail
- Stakeholder Contact Map with role, sentiment, email, LinkedIn
- Competitive Intelligence Tracker with multi-select competitors and filtering
- CSV/Excel Export on accounts, activities, and pipeline pages
- Data Quality Dashboard in admin with completeness scoring
- Campaign Playbook Templates with 5 default plays and account progress tracking
- Goals & District Targets with quarterly tracking and progress bars
- Weekly Status Report (printable) and Executive Summary (printable)
- Activity Effectiveness Scoring showing pipeline conversion by activity type
- Mobile Activity FAB for quick activity logging on mobile
- Multi-User Auth (NextAuth + Google OAuth, @broadcom.com domain, role-based)

Also adds Phase 2 API route, scoring utilities, sidebar navigation updates,
and database schema extensions for notes, contacts, snapshots, playbooks,
and district targets.

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

src/components/ui/ExportButton.tsx

@@ -0,0 +1,34 @@
+'use client';
+import { useState } from 'react';
+
+export function ExportButton({ table, label }: { table: string; label?: string }) {
+  const [loading, setLoading] = useState(false);
+
+  const handleExport = async () => {
+    setLoading(true);
+    try {
+      const res = await fetch('/api/phase2', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ action: 'export', table }),
+      });
+      if (!res.ok) throw new Error('Export failed');
+      const blob = await res.blob();
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = `${table}-export.csv`;
+      a.click();
+      URL.revokeObjectURL(url);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <button onClick={handleExport} disabled={loading} className="flex items-center gap-1.5 px-3 py-1.5 text-xs font-medium text-muted hover:text-foreground border border-card-border rounded-lg hover:bg-gray-50 transition disabled:opacity-50">
+      <svg className="w-3.5 h-3.5" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>
+      {loading ? 'Exporting...' : (label || 'Export CSV')}
+    </button>
+  );
+}