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/api/jobs/serp-enrich/route.ts

@@ -122,7 +122,6 @@ async function runSerpEnrich(
           contactName: result.person_full_name || null,
           contactTitle: result.person_job_title || null,
           email: result.email || null,
-          confidence: result.valid_email ? 1.0 : result.email_status === "risky" ? 0.5 : 0,
           linkedinUrl: result.person_linkedin_url || null,
           source: JSON.stringify({
             url: serpData?.url,
@@ -150,7 +149,6 @@ async function runSerpEnrich(
           contactTitle: r.person_job_title || null,
           email: r.email || null,
           linkedinUrl: r.person_linkedin_url || null,
-          emailConfidence: r.valid_email ? 1.0 : r.email_status === "risky" ? 0.5 : 0,
           serpTitle: serpData?.title || null,
           serpSnippet: serpData?.description || null,
           serpRank: serpData?.position ?? null,