fix: inline citations now upgrade to highlighted view (Phase 5.4)

- Added sub_question_text to frontend SourceMetadata type
- SubQuestionSection enriches sources with parent sub-question text
- buildCitationUrl routes to highlight page when sub_question_text present
- processCitations threads highlightReadyKeys through inline citations

frontend/src/components/ResponsePanel.tsx

@@ -98,10 +98,13 @@ function SubQuestionSection({
   highlightReadyKeys: Set<string>
 }) {
   const [expanded, setExpanded] = useState(false)
+  // Enrich sources with sub_question_text so buildCitationUrl can route to highlight page.
   // Look up citations across ALL sub-questions' sources because the LLM
   // may cite chunks from other sub-questions' contexts.
-  const allSources = allSubQuestionSources.flatMap(sq => sq.sources)
+  const allSources = allSubQuestionSources.flatMap(sq =>
-  const processedAnswer = processCitations(answerSection, allSources)
+    sq.sources.map(s => ({ ...s, sub_question_text: sq.sub_question_text }))
+  )
+  const processedAnswer = processCitations(answerSection, allSources, highlightReadyKeys)
 
   return (
     <div

frontend/src/types/index.ts

@@ -6,6 +6,7 @@ export interface SourceMetadata {
   page_number: number | null
   chunk_file_path: string | null
   document_id: string | null
+  sub_question_text?: string
 }
 
 export interface SubQuestionSources {

frontend/src/utils/citationParser.ts

@@ -52,13 +52,17 @@ export function buildCitationLookupForSubq(
 export function processCitationsForSubq(
   answerSection: string,
   subQuestionSources: SubQuestionSources[],
-  subqIndex: number
+  subqIndex: number,
+  highlightKeys?: Set<string>
 ): string {
   const lookup = buildCitationLookupForSubq(subQuestionSources, subqIndex)
-  return replaceCitationPatterns(answerSection, lookup)
+  return replaceCitationPatterns(answerSection, lookup, highlightKeys)
 }
 
-function buildCitationUrl(source: SourceMetadata): string | null {
+function buildCitationUrl(source: SourceMetadata, highlightReady?: boolean): string | null {
+  if (highlightReady && source.document_id && source.sub_question_text) {
+    return `/api/v1/v2/highlights?document_id=${encodeURIComponent(source.document_id)}&chunk_index=${source.chunk_index}&sub_question=${encodeURIComponent(source.sub_question_text)}`
+  }
   if (source.chunk_file_path) {
     return getPdfViewerUrl(
       source.chunk_file_path,
@@ -99,7 +103,8 @@ function findSource(
 
 function replaceCitationPatterns(
   text: string,
-  lookup: Map<string, SourceMetadata>
+  lookup: Map<string, SourceMetadata>,
+  highlightKeys?: Set<string>
 ): string {
   const citationPattern = /(?<!!)\[([^\]]+)\](?!\()/g
 
@@ -108,7 +113,13 @@ function replaceCitationPatterns(
     const source = findSource(trimmed, lookup)
 
     if (source) {
-      const url = buildCitationUrl(source)
+      let isReady = false
+      if (highlightKeys && source.document_id && source.sub_question_text) {
+        isReady = highlightKeys.has(
+          `${source.document_id}_${source.chunk_index}_${encodeURIComponent(source.sub_question_text)}`
+        )
+      }
+      const url = buildCitationUrl(source, isReady)
       if (url) {
         return `[${trimmed}](${url})`
       }
@@ -118,11 +129,11 @@ function replaceCitationPatterns(
   })
 }
 
-export function processCitations(text: string, sources: SourceMetadata[]): string {
+export function processCitations(text: string, sources: SourceMetadata[], highlightKeys?: Set<string>): string {
   if (!sources.length) return text
 
   const lookup = buildCitationLookup(sources)
-  return replaceCitationPatterns(text, lookup)
+  return replaceCitationPatterns(text, lookup, highlightKeys)
 }
 
 export function extractCitedSources(answerText: string, sources: SourceMetadata[]): SourceMetadata[] {