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>

app/linkedin/page.tsx

@@ -176,10 +176,6 @@ export default function LinkedInPage() {
     contact_name: r.contactName,
     contact_title: r.contactTitle,
     email: r.email,
-    confidence_score: r.confidence !== undefined ? Math.round(r.confidence * 100) : undefined,
-    source_tab: "linkedin",
-    job_id: scrapeJobId || "",
-    found_at: new Date().toISOString(),
   }));
 
   const emailsFound = results.filter(r => r.email).length;