fix(webui): preserve single newlines in markdown rendering

Add remark-breaks plugin so that single newlines in assistant messages
(such as /help output) render as line breaks instead of being collapsed
into a single paragraph by standard markdown behavior.

webui/bun.lock

@@ -23,6 +23,7 @@
         "react-markdown": "^9.0.1",
         "react-syntax-highlighter": "^15.6.1",
         "rehype-katex": "^7.0.1",
+        "remark-breaks": "^4.0.0",
         "remark-gfm": "^4.0.0",
         "remark-math": "^6.0.0",
         "tailwind-merge": "^2.6.0",
@@ -594,6 +595,8 @@
 
     "mdast-util-mdxjs-esm": ["mdast-util-mdxjs-esm@2.0.1", "", { "dependencies": { "@types/estree-jsx": "^1.0.0", "@types/hast": "^3.0.0", "@types/mdast": "^4.0.0", "devlop": "^1.0.0", "mdast-util-from-markdown": "^2.0.0", "mdast-util-to-markdown": "^2.0.0" } }, "sha512-EcmOpxsZ96CvlP03NghtH1EsLtr0n9Tm4lPUJUBccV9RwUOneqSycg19n5HGzCf+10LozMRSObtVr3ee1WoHtg=="],
 
+    "mdast-util-newline-to-break": ["mdast-util-newline-to-break@2.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-find-and-replace": "^3.0.0" } }, "sha512-MbgeFca0hLYIEx/2zGsszCSEJJ1JSCdiY5xQxRcLDDGa8EPvlLPupJ4DSajbMPAnC0je8jfb9TiUATnxxrHUog=="],
+
     "mdast-util-phrasing": ["mdast-util-phrasing@4.1.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "unist-util-is": "^6.0.0" } }, "sha512-TqICwyvJJpBwvGAMZjj4J2n0X8QWp21b9l0o7eXyVJ25YNWYbJDVIyD1bZXE6WtV6RmKJVYmQAKWa0zWOABz2w=="],
 
     "mdast-util-to-hast": ["mdast-util-to-hast@13.2.1", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/mdast": "^4.0.0", "@ungap/structured-clone": "^1.0.0", "devlop": "^1.0.0", "micromark-util-sanitize-uri": "^2.0.0", "trim-lines": "^3.0.0", "unist-util-position": "^5.0.0", "unist-util-visit": "^5.0.0", "vfile": "^6.0.0" } }, "sha512-cctsq2wp5vTsLIcaymblUriiTcZd0CwWtCbLvrOzYCDZoWyMNV8sZ7krj09FSnsiJi3WVsHLM4k6Dq/yaPyCXA=="],
@@ -750,6 +753,8 @@
 
     "rehype-katex": ["rehype-katex@7.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/katex": "^0.16.0", "hast-util-from-html-isomorphic": "^2.0.0", "hast-util-to-text": "^4.0.0", "katex": "^0.16.0", "unist-util-visit-parents": "^6.0.0", "vfile": "^6.0.0" } }, "sha512-OiM2wrZ/wuhKkigASodFoo8wimG3H12LWQaH8qSPVJn9apWKFSH3YOCtbKpBorTVw/eI7cuT21XBbvwEswbIOA=="],
 
+    "remark-breaks": ["remark-breaks@4.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-newline-to-break": "^2.0.0", "unified": "^11.0.0" } }, "sha512-IjEjJOkH4FuJvHZVIW0QCDWxcG96kCq7An/KVH2NfJe6rKZU2AsHeB3OEjPNRxi4QC34Xdx7I2KGYn6IpT7gxQ=="],
+
     "remark-gfm": ["remark-gfm@4.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-gfm": "^3.0.0", "micromark-extension-gfm": "^3.0.0", "remark-parse": "^11.0.0", "remark-stringify": "^11.0.0", "unified": "^11.0.0" } }, "sha512-1quofZ2RQ9EWdeN34S79+KExV1764+wCUGop5CPL1WGdD0ocPpu91lzPGbwWMECpEpd42kJGQwzRfyov9j4yNg=="],
 
     "remark-math": ["remark-math@6.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-math": "^3.0.0", "micromark-extension-math": "^3.0.0", "unified": "^11.0.0" } }, "sha512-MMqgnP74Igy+S3WwnhQ7kqGlEerTETXMvJhrUzDikVZ2/uogJCb+WHUg97hK9/jcfc0dkD73s3LN8zU49cTEtA=="],

webui/package.json

@@ -30,6 +30,7 @@
     "react-markdown": "^9.0.1",
     "react-syntax-highlighter": "^15.6.1",
     "rehype-katex": "^7.0.1",
+    "remark-breaks": "^4.0.0",
     "remark-gfm": "^4.0.0",
     "remark-math": "^6.0.0",
     "tailwind-merge": "^2.6.0"

webui/src/components/MarkdownTextRenderer.tsx

@@ -2,6 +2,7 @@ import { Children, isValidElement, useMemo } from "react";
 import type { Components } from "react-markdown";
 import ReactMarkdown from "react-markdown";
 import rehypeKatex from "rehype-katex";
+import remarkBreaks from "remark-breaks";
 import remarkGfm from "remark-gfm";
 import remarkMath from "remark-math";
 
@@ -17,7 +18,7 @@ interface MarkdownTextRendererProps {
   highlightCode?: boolean;
 }
 
-const remarkPlugins = [remarkGfm, remarkMath];
+const remarkPlugins = [remarkBreaks, remarkGfm, remarkMath];
 const rehypePlugins = [rehypeKatex];
 
 /**