小熊 09d45046e5 Feat/web markdown UI updates (#14214) ...

### What problem does this PR solve?

LLM/chat and search UIs render Markdown in several places (document
preview, floating chat widget, next-search, etc.). Plugin lists and
behavior were duplicated or inconsistent, and single newlines in model
output were not always rendered as visible line breaks, which hurts
readability for chat-style content.

This PR centralizes shared **remark/rehype** configuration (including
**`remark-breaks`** for newline handling) and wires the main Markdown
surfaces to use it, so behavior is consistent and easier to maintain.


### Type of change

- [x] Refactoring

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Co-authored-by: Yingfeng Zhang <yingfeng.zhang@gmail.com>

2026-05-15 22:29:44 +08:00

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