feat: integrate Hardcover API for books

- Add lib/hardcover.ts with GraphQL client for Hardcover API
- Add routes/api/books/[name].ts for creating books via Hardcover ID
- Add routes/api/books/enhance/[name].ts for enhancing books
- Add routes/api/hardcover/query.ts for searching books
- Add routes/books/[name].tsx and index.tsx for book pages

routes/books/index.tsx

@@ -0,0 +1,62 @@
+import { Handlers, PageProps } from "$fresh/server.ts";
+import { MainLayout } from "@components/layouts/main.tsx";
+import { type BookResource, GenericResource } from "@lib/marka/schema.ts";
+import { KMenu } from "@islands/KMenu.tsx";
+import { Grid } from "@components/Grid.tsx";
+import { IconArrowLeft } from "@components/icons.tsx";
+import { RedirectSearchHandler } from "@islands/Search.tsx";
+import { parseResourceUrl, searchResource } from "@lib/search.ts";
+import { ResourceCard } from "@components/Card.tsx";
+import { Link } from "@islands/Link.tsx";
+import { listResources } from "@lib/marka/index.ts";
+
+export const handler: Handlers<
+  { books: BookResource[] | null; searchResults?: GenericResource[] }
+> = {
+  async GET(req, ctx) {
+    const books = await listResources<BookResource>("books");
+    const searchParams = parseResourceUrl(req.url);
+    const searchResults = searchParams &&
+      await searchResource({ ...searchParams, types: ["books"] });
+    return ctx.render({ books, searchResults });
+  },
+};
+
+export default function Greet(
+  props: PageProps<
+    { books: BookResource[] | null; searchResults: GenericResource[] }
+  >,
+) {
+  const { books, searchResults } = props.data;
+  return (
+    <MainLayout
+      url={props.url}
+      title="Books"
+      context={{ type: "books" }}
+      searchResults={searchResults}
+    >
+      <header class="flex gap-4 items-center mb-5 md:hidden">
+        <Link
+          class="px-4 ml-4 py-2 bg-gray-300 text-gray-800 rounded-lg flex items-center gap-1"
+          href="/"
+        >
+          <IconArrowLeft class="w-5 h-5" />
+          Back
+        </Link>
+
+        <h3 class="text-2xl text-white font-light">📚 Books</h3>
+      </header>
+      <RedirectSearchHandler />
+      <KMenu type="main" context={{ type: "books" }} />
+      <Grid>
+        {books?.map((doc, i) => (
+          <ResourceCard
+            key={doc.name || i}
+            sublink="books"
+            res={doc}
+          />
+        ))}
+      </Grid>
+    </MainLayout>
+  );
+}