feat(pdf): support GraphRAG text_bbox highlighting in PDF viewer

When documents are processed through GraphRAG pipeline, coordinate
enrichment produces text_bbox (paragraph-level coordinates) instead of
char_positions (character-level OCR coordinates). Added resolveCharPositions()
helper that converts text_bbox to CharPosition[] format, enabling PDF
highlight rendering for GraphRAG-processed documents.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/routes/reviews.tsx

@@ -386,6 +386,7 @@ export default function ReviewDetails() {
   const [targetPage, setTargetPage] = useState<number | undefined>(undefined);
   const [templateTargetPage, setTemplateTargetPage] = useState<number | undefined>(undefined);
   const [charPositions, setCharPositions] = useState<Array<{ box: number[][], char: string, score: number }> | undefined>(undefined);
+  const [textBbox, setTextBbox] = useState<{ x_min: number; y_min: number; x_max: number; y_max: number } | undefined>(undefined);
   const [highlightValue, setHighlightValue] = useState<string | undefined>(undefined);
   const [pendingUpdate, setPendingUpdate] = useState<{
     reviewPointResultId: string;
@@ -551,17 +552,19 @@ export default function ReviewDetails() {
     setActiveTab(tabKey);
   };
   
-  const handleReviewPointSelect = (reviewPointId: string, page?: number, charPos?: Array<{ box: number[][], char: string, score: number }>, value?: string) => {
+  const handleReviewPointSelect = (reviewPointId: string, page?: number, charPos?: Array<{ box: number[][], char: string, score: number }>, value?: string, bbox?: { x_min: number; y_min: number; x_max: number; y_max: number }) => {
     // 如果点击的是相同的评查点，但有page参数，先重置targetPage以确保useEffect能够触发
     if (reviewPointId === activeReviewPointResultId && page) {
       setTargetPage(undefined);
       setCharPositions(undefined);
+      setTextBbox(undefined);
       setHighlightValue(undefined);
       // 使用setTimeout确保状态更新后再设置新的targetPage、charPositions和highlightValue
       setTimeout(() => {
         setActiveReviewPointResultId(reviewPointId);
         setTargetPage(page);
         setCharPositions(charPos);
+        setTextBbox(bbox);
         setHighlightValue(value);
       }, 0);
     } else {
@@ -569,6 +572,7 @@ export default function ReviewDetails() {
       setActiveReviewPointResultId(reviewPointId);
       setTargetPage(page);
       setCharPositions(charPos);
+      setTextBbox(bbox);
       setHighlightValue(value);
     }
   };
@@ -966,6 +970,7 @@ export default function ReviewDetails() {
                         activeReviewPointResultId={activeReviewPointResultId}
                         targetPage={targetPage}
                         charPositions={charPositions}
+                        textBbox={textBbox}
                         highlightValue={highlightValue}
                         userInfo={loaderData.userInfo}
                         aiSuggestionReplace={aiSuggestionReplace}
@@ -1019,6 +1024,7 @@ export default function ReviewDetails() {
                     activeReviewPointResultId={activeReviewPointResultId}
                     targetPage={targetPage}
                     charPositions={charPositions}
+                        textBbox={textBbox}
                   />
                 </div>