UI improvements: Leadspeicher, Maps enrichment, exports

- Rename LeadVault → Leadspeicher throughout (sidebar, topbar, page)
- SidePanel: full lead detail view with contact, source, tags (read-only), Google Maps link for address
- Tags: kontaktiert stored as tag (toggleable), favorit tag toggle
- Remove Status column, StatusBadge dropdown, Priority feature
- Remove Aktualisieren button from Leadspeicher
- Bulk actions: remove status dropdown
- Export: LeadVault Excel-only, clean columns, freeze row + autofilter
- Export dropdown: click-based (fix overflow-hidden clipping)
- ExportButtons: remove CSV, Excel only everywhere
- Maps page: post-search Anymailfinder enrichment button
- ProgressCard: "Suche läuft..." instead of "Warte auf Anymailfinder-Server..."
- Quick SERP renamed to "Schnell neue Suche"
- Results page: Excel export, always-enabled download button
- Anymailfinder: fix bulk field names, array-of-arrays format
- Apify: fix countryCode lowercase
- API: sourceTerm search, contacted/favorite tag filters

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

components/layout/Sidebar.tsx

@@ -12,7 +12,7 @@ const navItems = [
   { href: "/linkedin", icon: Linkedin, label: "LinkedIn → Email", color: "text-blue-500" },
   { href: "/serp", icon: Search, label: "SERP → Email", color: "text-purple-400" },
   { href: "/maps", icon: MapPin, label: "Maps → Email", color: "text-green-400" },
-  { href: "/leadvault", icon: Database, label: "LeadVault", color: "text-violet-400", badge: true },
+  { href: "/leadvault", icon: Database, label: "Leadspeicher", color: "text-violet-400", badge: true },
   { href: "/results", icon: BarChart3, label: "Ergebnisse & Verlauf", color: "text-yellow-400" },
   { href: "/settings", icon: Settings, label: "Einstellungen", color: "text-gray-400" },
 ];

components/layout/TopBar.tsx

@@ -9,7 +9,7 @@ const BREADCRUMBS: Record<string, string> = {
   "/linkedin": "LinkedIn → E-Mail",
   "/serp": "SERP → E-Mail",
   "/maps": "Google Maps → E-Mail",
-  "/leadvault": "🗄️ LeadVault",
+  "/leadvault": "🗄️ Leadspeicher",
   "/results": "Ergebnisse & Verlauf",
   "/settings": "Einstellungen",
 };