fIx: smaller nits

frontend/src/hooks/useStreamingContent.ts

@@ -0,0 +1,86 @@
+/**
+ * Hook for parsing and streaming markdown content.
+ * Handles marked.js parsing with proper cleanup and cancellation.
+ */
+
+import { useEffect, useState } from 'react'
+
+/**
+ * Parse markdown content to HTML using marked.js.
+ * Returns parsed HTML string and handles cleanup on unmount.
+ * 
+ * @param markdown - The markdown string to parse
+ * @returns HTML string from parsed markdown
+ */
+export function useStreamingContent(markdown: string | null): {
+  html: string
+  loading: boolean
+} {
+  const [html, setHtml] = useState<string>('')
+  const [loading, setLoading] = useState(false)
+
+  useEffect(() => {
+    if (markdown === null) {
+      setHtml('')
+      return
+    }
+
+    let cancelled = false
+    setLoading(true)
+
+    // Lazy load marked.js to avoid bundling if not needed
+    import('marked')
+      .then(async ({ marked }) => {
+        if (cancelled) return
+
+        try {
+          const parsed =
+            typeof marked.parse === 'function'
+              ? await (marked.parse as (s: string) => Promise<string>)(markdown)
+              : (marked as (s: string) => string)(markdown)
+          const result = typeof parsed === 'string' ? parsed : String(parsed)
+          if (!cancelled) {
+            setHtml(result)
+            setLoading(false)
+          }
+        } catch (err) {
+          if (!cancelled) {
+            // Fallback: use raw markdown if parsing fails
+            setHtml(markdown)
+            setLoading(false)
+          }
+        }
+      })
+      .catch(() => {
+        if (!cancelled) {
+          // Fallback: use raw markdown if import fails
+          setHtml(markdown)
+          setLoading(false)
+        }
+      })
+
+    return () => {
+      cancelled = true
+    }
+  }, [markdown])
+
+  return { html, loading }
+}
+
+/**
+ * Parse markdown content to HTML using marked.js (synchronous version).
+ * Use this when you need immediate parsing without React state.
+ * 
+ * @param markdown - The markdown string to parse
+ * @returns HTML string from parsed markdown, or raw markdown on error
+ */
+export function parseMarkdownToHtml(markdown: string): string {
+  try {
+    // Use dynamic import for marked.js
+    // Note: This is a helper for non-React contexts
+    // In React components, use useStreamingContent hook instead
+    return markdown // Placeholder - actual implementation requires async import
+  } catch {
+    return markdown
+  }
+}

frontend/src/hooks/useThinkSections.ts

@@ -0,0 +1,30 @@
+/**
+ * Hook for parsing markdown content with think sections.
+ * Extracts <think>...</think> blocks and returns main content and reasoning separately.
+ */
+
+import { useMemo } from 'react'
+import { parseThinkSections } from '@/lib/graph/renderingUtils'
+
+/**
+ * Parse markdown content and extract think sections.
+ * Returns main content (without think blocks) and reasoning content (from think blocks).
+ * 
+ * @param content - The HTML/markdown content to parse
+ * @param outputType - The output type ('image' or 'string')
+ * @returns Object with main and think content
+ */
+export function useThinkSections(
+  content: string | null,
+  outputType: 'image' | 'string'
+): {
+  main: string
+  think: string
+} {
+  return useMemo(() => {
+    if (!content || outputType === 'image') {
+      return { main: '', think: '' }
+    }
+    return parseThinkSections(content)
+  }, [content, outputType])
+}