fix: don't enrich chapter-filtered diffs with full file content

Pierre requires all hunks to be present when isPartial=false (trailing
context must match on both sides). Chapter pages show a subset of hunks,
so enrichment is only correct on the Files page where the full per-file
diff is used.

Author: dastratakos

packages/web/src/lib/filter-files-for-chapter.ts

@@ -1,8 +1,7 @@
 import { getSingularPatch } from "@pierre/diffs";
 import type { HunkReference } from "@stagereview/types/chapters";
-import type { FileContentsMap } from "@stagereview/types/diff";
 import type { FileDiffEntry } from "./parse-diff";
-import { enrichFileDiff, fileDiffToPullRequestFile } from "./parse-diff";
+import { fileDiffToPullRequestFile } from "./parse-diff";
 
 const HUNK_HEADER_RE = /^@@\s+-(\d+)(?:,\d+)?\s+\+\d+(?:,\d+)?\s+@@/;
 const FILE_BREAK = /\ndiff --git /g;
@@ -89,7 +88,6 @@ function filterHunksInFile(perFileText: string, oldStarts: ReadonlySet<number>):
 export function filterFilesForChapter(
 	patch: string,
 	hunkRefs: readonly HunkReference[],
-	fileContents?: FileContentsMap,
 ): FileDiffEntry[] {
 	if (hunkRefs.length === 0) return [];
 
@@ -120,8 +118,7 @@ export function filterFilesForChapter(
 		const filteredText = filterHunksInFile(segment.text, oldStarts);
 		if (filteredText === null) continue;
 
-		const baseDiff = getSingularPatch(filteredText);
-		const diff = enrichFileDiff(baseDiff, fileContents);
+		const diff = getSingularPatch(filteredText);
 		result.push({ file: fileDiffToPullRequestFile(diff), diff });
 	}
 

packages/web/src/routes/chapter-detail-page.tsx

@@ -1,5 +1,4 @@
 import type { Chapter, LineRef } from "@stagereview/types/chapters";
-import type { FileContentsMap } from "@stagereview/types/diff";
 import { Link, useNavigate } from "@tanstack/react-router";
 import { useCallback, useMemo, useRef, useState } from "react";
 import { useHotkeys } from "react-hotkeys-hook";
@@ -58,28 +57,17 @@ export function ChapterDetailPage({ runId, chapterNumber }: ChapterDetailPagePro
 	}
 
 	return (
-		<ChapterDetailContent
-			chapter={chapter}
-			chapterIndex={chapterIndex}
-			patch={diffData.patch}
-			fileContents={diffData.fileContents}
-		/>
+		<ChapterDetailContent chapter={chapter} chapterIndex={chapterIndex} patch={diffData.patch} />
 	);
 }
 
 interface ChapterDetailContentProps {
 	chapter: Chapter;
 	chapterIndex: number;
 	patch: string;
-	fileContents: FileContentsMap;
 }
 
-function ChapterDetailContent({
-	chapter,
-	chapterIndex,
-	patch,
-	fileContents,
-}: ChapterDetailContentProps) {
+function ChapterDetailContent({ chapter, chapterIndex, patch }: ChapterDetailContentProps) {
 	const { runId, chapters: allChapters } = useChapterContext();
 	const view = useViewState(runId);
 	const [focusedKeyChangeId, setFocusedKeyChangeId] = useState<string | null>(null);
@@ -93,8 +81,8 @@ function ChapterDetailContent({
 	}
 
 	const chapterEntries = useMemo(
-		() => filterFilesForChapter(patch, chapter.hunkRefs, fileContents),
-		[patch, chapter.hunkRefs, fileContents],
+		() => filterFilesForChapter(patch, chapter.hunkRefs),
+		[patch, chapter.hunkRefs],
 	);
 
 	const allLineRefsByFile = useMemo(