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/leads/route.ts

@@ -20,6 +20,8 @@ export async function GET(req: NextRequest) {
     const priorities = searchParams.getAll("priority");
     const tags = searchParams.getAll("tags");
     const searchTerms = searchParams.getAll("searchTerm");
+    const contacted = searchParams.get("contacted");
+    const favorite = searchParams.get("favorite");
 
     const where: Prisma.LeadWhereInput = {};
 
@@ -30,6 +32,7 @@ export async function GET(req: NextRequest) {
         { contactName: { contains: search } },
         { email: { contains: search } },
         { notes: { contains: search } },
+        { sourceTerm: { contains: search } },
       ];
     }
 
@@ -50,6 +53,14 @@ export async function GET(req: NextRequest) {
       where.sourceTerm = { in: searchTerms };
     }
 
+    if (contacted === "yes") {
+      where.tags = { contains: "kontaktiert" };
+    }
+
+    if (favorite === "yes") {
+      where.tags = { contains: "favorit" };
+    }
+
     if (tags.length > 0) {
       // SQLite JSON contains — search for each tag in the JSON string
       where.AND = tags.map(tag => ({