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22c6648348
Closes #9078 ### What problem does this PR solve? The `retrieval_test` endpoint in `chunk_app.py` never forwarded the `highlight` request parameter to `retriever.retrieval()`, so the search engine never produced highlight snippets. Additionally, the frontend always rendered `content_with_weight` instead of preferring the `highlight` field, and the CSS rule color `var(--accent-primary)` didn't work because the variable stores an RGB triplet `(45,212,191)` requiring the `rgb()` wrapper. ### Before - Search page: displayed raw content_with_weight as a wall of plain white text with no term highlighting, including markdown headings rendered as literal text - Retrieval testing page: showed `content_with_weight` in a plain `<p>` tag, no `<em>` tags rendered, no highlight coloring - Children chunks: when child chunks were consolidated into a parent via `retrieval_by_children`, any highlight data from children was discarded - TOC chunks: chunks fetched via `retrieval_by_toc` had no `highlight` field, appearing as plain text while other chunks had highlights **Retrieval testing**: <img width="1449" height="1178" alt="before-retrieval-no-highlight-cropped" src="https://github.com/user-attachments/assets/5c6f5a5e-6c11-461a-bdb4-049d7dfb7a33" /> **Search**: <img width="1378" height="711" alt="before-search-no-highlight-cropped" src="https://github.com/user-attachments/assets/be7b5152-72ef-40da-a8fd-921e997ae7d3" /> ### After - Search page: displays the highlight field with search terms rendered in teal/cyan color (`rgb(var(--accent-primary))`) - Retrieval testing page: sends highlight: true in the request, uses `HighLightMarkdown` component to render `<em>` tags with proper coloring - Children chunks: highlights from child chunks are joined and preserved on the parent - TOC chunks: when other chunks have highlights, TOC-fetched chunks use `content_with_weight` as a highlight fallback **Retrieval testing**: <img width="1410" height="1015" alt="05-retrieval-testing-results" src="https://github.com/user-attachments/assets/f0cff8cf-0962-4320-b559-cd5037f622d2" /> **Search**: <img width="1294" height="455" alt="03-search-highlight-results" src="https://github.com/user-attachments/assets/a90e0e3e-3837-46be-8ddd-2412ff7cbc19" /> ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)