Add ZXDB breadcrumbs and release places

Add ZXDB breadcrumbs on list/detail pages and group release
magazine references by issue for clearer Places view.

Signed-off-by: codex@lucy.xalior.com

src/app/zxdb/entries/EntriesExplorer.tsx

@@ -4,6 +4,7 @@ import { useEffect, useMemo, useState } from "react";
 import Link from "next/link";
 import EntryLink from "../components/EntryLink";
 import { usePathname, useRouter } from "next/navigation";
+import ZxdbBreadcrumbs from "@/app/zxdb/components/ZxdbBreadcrumbs";
 
 type Item = {
   id: number;
@@ -178,6 +179,13 @@ export default function EntriesExplorer({
 
   return (
     <div>
+      <ZxdbBreadcrumbs
+        items={[
+          { label: "ZXDB", href: "/zxdb" },
+          { label: "Entries" },
+        ]}
+      />
+
       <h1 className="mb-3">Entries</h1>
       <form className="row gy-2 gx-2 align-items-center" onSubmit={onSubmit}>
         <div className="col-sm-8 col-md-6 col-lg-4">