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### What problem does this PR solve? Fixes #15117. Chunk images are stored with `img_id = f"{bucket}-{objname}"` in `image2id()` (`rag/utils/base64_image.py`). When loading via `id2image()`, the code used `image_id.split("-")` and required exactly two segments. Object keys that contain hyphens (e.g. `page-1.jpg`) produce more than two segments, so `id2image` returns `None` and chunk image previews fail even though the blob exists. This is the same parsing issue as #15115 (HTTP thumbnail route); this PR fixes the indexing/retrieval path. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) - [ ] New Feature (non-breaking change which adds functionality) - [ ] Documentation Update - [ ] Refactoring - [ ] Performance Improvement - [ ] Other (please describe): ### Test plan - [x] `pytest test/unit_test/rag/utils/test_base64_image.py` - [ ] Manual: index a chunk with an `objname` containing hyphens and confirm `img_id` resolves to an image in retrieval Fixes #15117.