fix: before/after works for compose (source fallback), hidden for text-only; add reuse result as new Studio input

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XNQ8ghPfzAfsyVYd6HgFb6

src/pages/api/items/[id]/file.ts

@@ -11,9 +11,10 @@ export const GET: APIRoute = async ({ params, url, locals }) => {
   const wantThumb = q.get('thumb') === '1';
   const wantSrc = q.get('src') === '1';
   const item = await one<any>(
-    `SELECT source_path, result_path, thumb_path, filename, has_alpha FROM items WHERE id=$1`, [params.id]);
-  // Vorschau: Thumbnail bevorzugen, sonst Ergebnis. Quelle nur explizit.
-  const path = wantSrc ? item?.source_path
+    `SELECT source_path, source_paths, result_path, thumb_path, filename, has_alpha FROM items WHERE id=$1`, [params.id]);
+  // Quelle: Einzelquelle, sonst erste Kombinier-Quelle (für Vorher/Nachher).
+  const firstSource = item?.source_path || (Array.isArray(item?.source_paths) ? item.source_paths[0] : null);
+  const path = wantSrc ? firstSource
     : wantThumb ? (item?.thumb_path || item?.result_path)
     : item?.result_path;
   if (!path) return new Response('Nicht gefunden', { status: 404 });

src/pages/api/items/[id]/reuse.ts

@@ -0,0 +1,26 @@
+import type { APIRoute } from 'astro';
+import { randomUUID } from 'node:crypto';
+import { one } from '../../../../lib/db';
+import { getObject, putObject, sourceKey } from '../../../../lib/storage';
+
+export const prerender = false;
+const json = (b: unknown, s = 200) =>
+  new Response(JSON.stringify(b), { status: s, headers: { 'Content-Type': 'application/json' } });
+
+/** Kopiert das Ergebnis eines Items in eine neue Quelle, damit es im Studio
+ *  als Vorlage weiterbearbeitet werden kann. */
+export const POST: APIRoute = async ({ params, locals }) => {
+  if (!locals.user) return new Response('Unauthorized', { status: 401 });
+  const it = await one<{ result_path: string | null; filename: string | null }>(
+    'SELECT result_path, filename FROM items WHERE id=$1', [params.id]);
+  if (!it?.result_path) return json({ error: 'Kein Ergebnis vorhanden.' }, 404);
+  try {
+    const buf = await getObject(it.result_path);
+    const key = sourceKey(randomUUID(), 'png');
+    await putObject(key, buf, 'image/png');
+    const name = (it.filename || 'bild').replace(/\.[^.]+$/, '') + '.png';
+    return json({ source_path: key, filename: name });
+  } catch (e: any) {
+    return json({ error: e?.message || 'Konnte Ergebnis nicht laden.' }, 500);
+  }
+};