feat(bulk): add "Download Example Images" to bulk select context menu (#923)

Allows downloading example images only for selected models instead of
the entire library. Reuses the existing /api/lm/force-download-example-images
endpoint which already accepts an array of model hashes.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

locales/he.json

@@ -692,6 +692,7 @@
             "unfavorite": "הסר ממועדפים",
             "deleteAll": "מחק נבחרים",
             "downloadMissingLoras": "הורדת LoRAs חסרים",
+            "downloadExamples": "הורד תמונות דוגמה",
             "clear": "נקה בחירה",
             "skipMetadataRefreshCount": "דילוג（{count} מודלים）",
             "resumeMetadataRefreshCount": "המשך（{count} מודלים）",