Add Atlas exports and custom Atlas InfoSec icon

Exports page:
- Add Atlas Action Plans export card with three reports: Full Status,
  Coverage Gaps, and Full Report (multi-sheet with active, gaps, history)
- Reports join Atlas cache with Ivanti findings for hostname, IP, BU context

Atlas icon:
- Add AtlasIcon SVG component matching the Atlas InfoSec logo (badge with globe)
- Replace Database icon with AtlasIcon on exports card, sync button, and panel header

frontend/src/components/AtlasSlideOutPanel.js

@@ -1,5 +1,6 @@
 import React, { useState, useEffect, useCallback, useRef } from 'react';
 import { X, Loader, Shield, Plus, Edit3, Check, AlertCircle, ChevronDown } from 'lucide-react';
+import AtlasIcon from './AtlasIcon';
 
 const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';
 
@@ -623,7 +624,7 @@ export default function AtlasSlideOutPanel({ hostId, hostName, findingId, qualys
           <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start' }}>
             <div style={{ minWidth: 0, flex: 1, marginRight: '0.75rem' }}>
               <div style={{ display: 'flex', alignItems: 'center', gap: '0.4rem', marginBottom: '0.3rem' }}>
-                <Shield style={{ width: 16, height: 16, color: ACCENT, flexShrink: 0 }} />
+                <AtlasIcon style={{ width: 16, height: 16, color: ACCENT, flexShrink: 0 }} />
                 <span style={{ fontSize: '0.9rem', fontWeight: 700, color: '#E2E8F0', wordBreak: 'break-all', lineHeight: 1.3 }}>
                   {hostName || 'Unknown Host'}
                 </span>