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/export/[jobId]/route.ts

@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
 import { prisma } from "@/lib/db";
-import Papa from "papaparse";
+import * as XLSX from "xlsx";
 
 export async function GET(
   req: NextRequest,
@@ -16,23 +16,22 @@ export async function GET(
     if (!job) return NextResponse.json({ error: "Job not found" }, { status: 404 });
 
     const rows = job.results.map(r => ({
-      company_name: r.companyName || "",
-      domain: r.domain || "",
-      contact_name: r.contactName || "",
-      contact_title: r.contactTitle || "",
-      email: r.email || "",
-      confidence_score: r.confidence !== null ? Math.round((r.confidence || 0) * 100) + "%" : "",
-      source_tab: job.type,
-      job_id: job.id,
-      found_at: r.createdAt.toISOString(),
+      "Unternehmen": r.companyName || "",
+      "Domain": r.domain || "",
+      "Kontaktname": r.contactName || "",
+      "Position": r.contactTitle || "",
+      "E-Mail": r.email || "",
     }));
 
-    const csv = Papa.unparse(rows);
+    const ws = XLSX.utils.json_to_sheet(rows);
+    const wb = XLSX.utils.book_new();
+    XLSX.utils.book_append_sheet(wb, ws, "Leads");
+    const arr = XLSX.write(wb, { type: "array", bookType: "xlsx" });
 
-    return new NextResponse(csv, {
+    return new NextResponse(new Uint8Array(arr), {
       headers: {
-        "Content-Type": "text/csv",
-        "Content-Disposition": `attachment; filename="leadflow-${job.type}-${jobId.slice(0, 8)}.csv"`,
+        "Content-Type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        "Content-Disposition": `attachment; filename="leadflow-${job.type}-${jobId.slice(0, 8)}.xlsx"`,
       },
     });
   } catch (err) {