fix(feed): resolve word→object links for picture lookup on word-type cards

Word-type placeholders in sentences (type='word') were never matched
against object_pictures, so those cards always had no image.
Now queries object_words by word_id to find associated objects,
adds them to resolvedObjectIds, and pickPicture checks wordObjectMap
as a fallback.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/feed.js

@@ -88,6 +88,7 @@ router.get('/', requireJwt, async (req, res, next) => {
 
     // 6. Resolve UUIDs → words (direct) or via objects→words
     const placeholderMap = {}; // uuid → { de, en, sv }
+    const wordObjectMap  = {}; // wordId → objectId (for picture lookup)
     if (uuidArr.length) {
       // Direct word lookup
       const wordRes = await query(
@@ -123,6 +124,17 @@ router.get('/', requireJwt, async (req, res, next) => {
           }
         });
       }
+
+      // For word-type placeholders: find linked objects so we can load their pictures
+      const wordUuids = uuidArr.filter(u => placeholderMap[u]?.type === 'word');
+      if (wordUuids.length) {
+        const wObjRes = await query(
+          `SELECT DISTINCT ON (ow.word_id) ow.word_id, ow.object_id
+             FROM object_words ow WHERE ow.word_id = ANY($1)`,
+          [wordUuids]
+        );
+        wObjRes.rows.forEach(r => { wordObjectMap[r.word_id] = r.object_id; });
+      }
     }
 
     // 7. Fetch statement→word links (positive + negative)
@@ -163,6 +175,8 @@ router.get('/', requireJwt, async (req, res, next) => {
       );
       objCheckRes.rows.forEach(r => resolvedObjectIds.add(r.id));
     }
+    // Also include objects linked to word-type placeholders
+    Object.values(wordObjectMap).forEach(oid => resolvedObjectIds.add(oid));
 
     const pictureMap = {}; // objectId → { url, blurhash }
     if (resolvedObjectIds.size) {
@@ -181,9 +195,12 @@ router.get('/', requireJwt, async (req, res, next) => {
     }
 
     // Pick first available picture across all placeholders in the pair
+    // Checks both direct object UUIDs and word-type UUIDs linked to objects
     function pickPicture(pairUuids) {
       for (const u of pairUuids) {
         if (pictureMap[u]) return pictureMap[u];
+        const oid = wordObjectMap[u];
+        if (oid && pictureMap[oid]) return pictureMap[oid];
       }
       return null;
     }