Add ISAC registry search controls

src/lib/components/RegistryPagination.svelte

@@ -1,12 +1,33 @@
 <script lang="ts">
 	import { page as currentPage } from '$app/state';
-	let { pagination, namespace = '' }: { pagination: { page: number; perPage: number; total: number; pageCount: number }; namespace?: string } = $props();
+	let {
+		pagination,
+		namespace = '',
+		search,
+		searchPlaceholder = 'SEARCH BY NAME'
+	}: {
+		pagination: { page: number; perPage: number; total: number; pageCount: number };
+		namespace?: string;
+		search?: string;
+		searchPlaceholder?: string;
+	} = $props();
+	const pageKey = $derived(namespace ? `${namespace}Page` : 'page');
+	const perPageKey = $derived(namespace ? `${namespace}PerPage` : 'perPage');
+	const searchKey = $derived(namespace ? `${namespace}Q` : 'q');
 	const href = (targetPage: number, perPage = pagination.perPage) => {
 		const params = new URLSearchParams(currentPage.url.searchParams);
-		params.set(namespace ? `${namespace}Page` : 'page', String(targetPage));
-		params.set(namespace ? `${namespace}PerPage` : 'perPage', String(perPage));
+		params.set(pageKey, String(targetPage));
+		params.set(perPageKey, String(perPage));
 		return `${currentPage.url.pathname}?${params}`;
 	};
+	const clearSearchHref = $derived.by(() => {
+		const params = new URLSearchParams(currentPage.url.searchParams);
+		params.delete(searchKey);
+		params.delete(pageKey);
+		const query = params.toString();
+		return `${currentPage.url.pathname}${query ? `?${query}` : ''}`;
+	});
+	const retainedParams = $derived([...currentPage.url.searchParams].filter(([key]) => key !== searchKey && key !== pageKey));
 	const visiblePages = $derived(
 		Array.from({ length: pagination.pageCount }, (_, index) => index + 1)
 			.filter((page) => page === 1 || page === pagination.pageCount || Math.abs(page - pagination.page) <= 2)
@@ -16,6 +37,14 @@
 </script>
 
 <nav class="registry-pagination" aria-label="Registry pagination">
+	{#if search !== undefined}
+		<form class="pagination-search">
+			{#each retainedParams as [key, value]}<input type="hidden" name={key} {value}/>{/each}
+			<input type="search" name={searchKey} value={search} maxlength="80" placeholder={searchPlaceholder} aria-label={searchPlaceholder}/>
+			<button class="secondary">SEARCH</button>
+			{#if search}<a href={clearSearchHref}>CLEAR</a>{/if}
+		</form>
+	{/if}
 	<div class="pagination-range"><span>DISPLAYING</span><b>{start}–{end}</b><span>OF {pagination.total}</span></div>
 	<div class="pagination-pages">
 		<a class:disabled={pagination.page === 1} aria-disabled={pagination.page === 1} href={href(Math.max(1, pagination.page - 1))}>← PREV</a>