fix: add _key to scenes array items for Sanity Studio

Sanity requires unique _key on every array item for Studio editing.
The ingest cron was passing Gemini's raw JSON without _key properties,
causing 'Missing keys' error in Studio.

Author: Miriad

app/api/cron/ingest/route.ts

@@ -292,7 +292,13 @@ async function createSanityDocuments(
 			_type: "reference",
 			_ref: contentIdea._id,
 		},
-		script: script.script,
+		script: {
+			...script.script,
+			scenes: script.script.scenes.map((scene, i) => ({
+				...scene,
+				_key: `scene-${i + 1}`,
+			})),
+		},
 		scriptQualityScore: criticResult.score,
 		status: isFlagged ? "flagged" : "script_ready",
 		...(isFlagged && {