feat: Cookie Banner Check as standalone tab in Compliance Agent

New "Banner-Check" tab with:
- URL input → Playwright 3-phase test (before/reject/accept)
- Shield icon + provider detection
- Progress bar with pass/fail percentage
- 3-phase summary (cookies + scripts per phase)
- Violations (red) and passes (green) in structured list

Backend: new POST /api/compliance/agent/banner-check endpoint
that proxies to consent-tester:8094/scan.

Next step: Upgrade banner checks to L1/L2 format with expert
hints (same quality as document checks).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/agent/page.tsx

@@ -7,9 +7,10 @@ import { AnalysisHistory } from './_components/AnalysisHistory'
 import { FollowUpQuestions } from './_components/FollowUpQuestions'
 import { ScanResult } from './_components/ScanResult'
 import { DocCheckTab } from './_components/DocCheckTab'
+import { BannerCheckTab } from './_components/BannerCheckTab'
 
 type AnalysisMode = 'pre_launch' | 'post_launch'
-type AnalysisTab = 'quick' | 'scan' | 'doc-check'
+type AnalysisTab = 'quick' | 'scan' | 'doc-check' | 'banner-check'
 
 const MODES: { id: AnalysisMode; label: string; desc: string; icon: string }[] = [
   { id: 'pre_launch', label: 'Internes Dokument', desc: 'Vor Veroeffentlichung pruefen', icon: '📋' },
@@ -20,6 +21,7 @@ const TABS: { id: AnalysisTab; label: string; desc: string }[] = [
   { id: 'quick', label: 'Schnellanalyse', desc: 'Einzelne Seite klassifizieren + bewerten' },
   { id: 'scan', label: 'Website-Scan', desc: 'Mehrere Seiten scannen + Dienstleister abgleichen' },
   { id: 'doc-check', label: 'Dokumenten-Pruefung', desc: 'Einzelne Dokumente gezielt pruefen' },
+  { id: 'banner-check', label: 'Banner-Check', desc: 'Cookie-Banner auf DSGVO-Konformitaet testen' },
 ]
 
 export default function AgentPage() {
@@ -224,8 +226,11 @@ export default function AgentPage() {
       {/* Doc Check Tab — own component */}
       {tab === 'doc-check' && <DocCheckTab />}
 
+      {/* Banner Check Tab — own component */}
+      {tab === 'banner-check' && <BannerCheckTab />}
+
       {/* URL Input (quick + scan only) */}
-      {tab !== 'doc-check' && <form onSubmit={handleSubmit} className="flex gap-3">
+      {(tab === 'quick' || tab === 'scan') && <form onSubmit={handleSubmit} className="flex gap-3">
         <input type="url" value={url} onChange={e => setUrl(e.target.value)}
           placeholder={tab === 'scan' ? 'https://www.example.com/' : 'https://example.com/datenschutz'}
           className="flex-1 px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent text-sm"