Add "Reissue an article" panel to the Retention admin tab

Wires up POST /api/admin/articles/:id/reissue (added alongside the
blank-article fix) as a UI panel instead of requiring curl: paste an
article ID, it deletes the article and requeues its source items for
re-publish. Verified live in a browser against a real backend/DB —
both the success path and the "no article with that ID" 404 case.

frontend/src/lib/adminApi.ts

@@ -107,6 +107,11 @@ export const pollSourceNow = (id: string, fetchFn?: typeof fetch) =>
 export const reissueSourceContent = (id: string, fetchFn?: typeof fetch) =>
 	request<{ articlesDeleted: number; itemsRequeued: number }>(`/api/admin/sources/${id}/reissue`, { method: 'POST' }, fetchFn);
 
+// Fixes one specific bad article regardless of how many sources it merged — unlike
+// reissueSourceContent above, which deliberately won't touch a multi-source article.
+export const reissueArticle = (id: string, fetchFn?: typeof fetch) =>
+	request<{ articlesDeleted: number; itemsRequeued: number }>(`/api/admin/articles/${id}/reissue`, { method: 'POST' }, fetchFn);
+
 // Content clearing — wipe articles/media/a source's raw items so they can be repopulated fresh.
 export const clearSourceContent = (id: string, fetchFn?: typeof fetch) =>
 	request<{ itemsDeleted: number; articlesDeleted: number }>(`/api/admin/content/sources/${id}`, { method: 'DELETE' }, fetchFn);

frontend/src/lib/components/admin/RetentionTab.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import type { AdminSettings } from '$lib/adminTypes';
-	import { updateSettings, clearAllArticles, clearAllMedia } from '$lib/adminApi';
+	import { updateSettings, clearAllArticles, clearAllMedia, reissueArticle } from '$lib/adminApi';
 	import SaveStatus from './SaveStatus.svelte';
 
 	let { settings }: { settings: AdminSettings } = $props();
@@ -11,6 +11,11 @@
 	let clearing = $state<'articles' | 'media' | null>(null);
 	let clearResult = $state<string | null>(null);
 
+	let reissueArticleId = $state('');
+	let reissuing = $state(false);
+	let reissueResult = $state<string | null>(null);
+	let reissueError = $state<string | null>(null);
+
 	let telegramMediaMode = $state(settings.telegramMediaMode);
 	let telegramMediaStatus = $state<'idle' | 'saving' | 'saved' | 'error'>('idle');
 	let telegramMediaSaveTimer: ReturnType<typeof setTimeout>;
@@ -60,6 +65,23 @@
 		}
 	}
 
+	async function handleReissueArticle() {
+		const id = reissueArticleId.trim();
+		if (!id) return;
+		reissuing = true;
+		reissueResult = null;
+		reissueError = null;
+		try {
+			const { itemsRequeued } = await reissueArticle(id);
+			reissueResult = `Deleted — ${itemsRequeued} source item(s) requeued for re-publish`;
+			reissueArticleId = '';
+		} catch (err) {
+			reissueError = /\(404\)/.test((err as Error).message) ? 'No article with that ID' : (err as Error).message;
+		} finally {
+			reissuing = false;
+		}
+	}
+
 	function scheduleSave() {
 		status = 'saving';
 		clearTimeout(saveTimer);
@@ -216,6 +238,39 @@
 	</div>
 </div>
 
+<div class="panel">
+	<span class="panel-title">Reissue an article</span>
+	<p class="hint">
+		Deletes one specific published article and requeues every source item it was built from, so
+		they re-cluster and re-synthesize fresh on the next scheduler tick — for fixing a single bad
+		publish (e.g. a garbled AI merge) without wiping anything else. Unlike a source's own "Clear
+		content" action, this works regardless of how many different sources the article merged
+		together. Find the article ID in its URL or via <code>GET /api/article/:id</code>.
+	</p>
+	<div class="clear-row">
+		<input
+			type="text"
+			placeholder="art-…"
+			bind:value={reissueArticleId}
+			onkeydown={(e) => e.key === 'Enter' && handleReissueArticle()}
+			style="flex: 1; min-width: 220px"
+		/>
+		<button
+			class="danger-btn"
+			onclick={handleReissueArticle}
+			disabled={reissuing || !reissueArticleId.trim()}
+		>
+			{reissuing ? 'Reissuing…' : 'Reissue'}
+		</button>
+		{#if reissueResult}
+			<span class="usage-label">{reissueResult}</span>
+		{/if}
+		{#if reissueError}
+			<span class="error-label">{reissueError}</span>
+		{/if}
+	</div>
+</div>
+
 <style>
 	.panel {
 		background: var(--surface-1);
@@ -276,6 +331,10 @@
 		font-size: 12px;
 		color: var(--text-muted);
 	}
+	.error-label {
+		font-size: 12px;
+		color: var(--text-danger);
+	}
 	.bar {
 		width: 100%;
 		height: 6px;