Replace the sample data with synthetic fixtures and regenerate goldens and thumbnails

The template harness, tests and thumbnails now use a neutral vendor, bank account and
a generated sample wordmark (scripts/logo/make-sample-logo.mjs). Layout goldens and the
14 picker thumbnails are regenerated. Fixture strings keep their original lengths where
layout tests depend on them.

src-tauri/src/integrations/erpnext/client.rs

@@ -404,7 +404,7 @@ mod tests {
             .await
             .unwrap();
         let raw = mock.requests.lock().unwrap()[0].clone();
-        assert!(raw.starts_with("GET /api/resource/Sales%20Invoice/AP%2F2026-001?limit_page_length=0 "), "{raw}");
+        assert!(raw.starts_with("GET /api/resource/Sales%20Invoice/INV%2F2026-001?limit_page_length=0 "), "{raw}");
     }
 
     #[tokio::test]

src-tauri/src/integrations/erpnext/push/tests.rs

@@ -820,7 +820,7 @@ fn sync_status_list_and_open_url() {
     let s = sync_status(&conn, inv.id).unwrap();
     assert_eq!((s.status.as_str(), s.remote_name.as_str(), s.remote_docstatus, s.attached), ("synced", "INV/2026-001", 1, true));
     assert_eq!(sync_statuses(&conn).unwrap(), vec![s]);
-    assert_eq!(open_url(&conn, inv.id).unwrap(), "http://127.0.0.1:8000/app/sales-invoice/AP%2F2026-001");
+    assert_eq!(open_url(&conn, inv.id).unwrap(), "http://127.0.0.1:8000/app/sales-invoice/INV%2F2026-001");
     // Names with spaces and other characters stay one path segment.
     conn.execute("UPDATE erpnext_sync SET remote_name = 'SINV 26/1?x' WHERE invoice_id = ?1", params![inv.id]).unwrap();
     assert_eq!(open_url(&conn, inv.id).unwrap(), "http://127.0.0.1:8000/app/sales-invoice/SINV%2026%2F1%3Fx");