feat: add handling for task timeout and enhance Streamdown plugin for word animation

frontend/src/core/streamdown/plugins.ts

@@ -3,6 +3,8 @@ import remarkGfm from "remark-gfm";
 import remarkMath from "remark-math";
 import type { StreamdownProps } from "streamdown";
 
+import { rehypeSplitWordsIntoSpans } from "../rehype";
+
 export const streamdownPlugins = {
   remarkPlugins: [
     remarkGfm,
@@ -13,6 +15,17 @@ export const streamdownPlugins = {
   ] as StreamdownProps["rehypePlugins"],
 };
 
+export const streamdownPluginsWithWordAnimation = {
+  remarkPlugins: [
+    remarkGfm,
+    [remarkMath, { singleDollarTextMath: true }],
+  ] as StreamdownProps["remarkPlugins"],
+  rehypePlugins: [
+    [rehypeKatex, { output: "html" }],
+    rehypeSplitWordsIntoSpans,
+  ] as StreamdownProps["rehypePlugins"],
+};
+
 // Plugins for human messages - no autolink to prevent URL bleeding into adjacent text
 export const humanMessagePlugins = {
   remarkPlugins: [