fix(review): show complete counts and load large diffs progressively

apps/mobile/src/features/review/ReviewSheet.tsx

@@ -382,24 +382,39 @@ export function ReviewSheet(props: ReviewSheetProps) {
   useEffect(() => {
     showAuxiliaryPane("inspector");
   }, [environmentId, showAuxiliaryPane, threadId]);
-  const { error, reviewSections, selectedSection, refreshSelectedSection, selectSection } =
-    useReviewSections({
-      enabled: isEnvironmentReady,
-      environmentId,
-      threadId,
-      reviewCache,
-    });
+  const {
+    error,
+    reviewSections,
+    selectedSection,
+    refreshSelectedSection,
+    selectSection,
+    isSelectedSectionPending,
+  } = useReviewSections({
+    enabled: isEnvironmentReady,
+    environmentId,
+    threadId,
+    reviewCache,
+  });
   useReviewDiffPrewarming({
     threadKey: reviewCache.threadKey,
     sections: reviewSections,
     selectedSectionId: selectedSection?.id ?? null,
   });
-  const { headerDiffSummary, nativeReviewDiffData, parsedDiff, pendingReviewCommentCount } =
-    useReviewDiffData({
-      threadKey: reviewCache.threadKey,
-      selectedSection,
-      draftMessage,
-    });
+  const {
+    headerDiffSummary,
+    nativeReviewDiffData,
+    parsedDiff,
+    pendingReviewCommentCount,
+    loadVisibleFile,
+    refreshFilePatches,
+    isPending: areFilePatchesPending,
+  } = useReviewDiffData({
+    threadKey: reviewCache.threadKey,
+    environmentId,
+    cwd: selectedThreadCwd,
+    selectedSection,
+    draftMessage,
+  });
   // Resolution returns null while Expo registers the native view (or forever
   // when the binary lacks it). Rendering a null component type crashes the
   // app, so callers must fall back — ThreadFeed's ReviewCommentCard does the
@@ -412,11 +427,12 @@ export function ReviewSheet(props: ReviewSheetProps) {
   const handlePullToRefresh = useCallback(async () => {
     setIsPullRefreshing(true);
     try {
+      refreshFilePatches();
       await refreshSelectedSection();
     } finally {
       setIsPullRefreshing(false);
     }
-  }, [refreshSelectedSection]);
+  }, [refreshSelectedSection, refreshFilePatches]);
   const reviewFileNavigatorRef = useRef<ReviewFileNavigatorHandle>(null);
   const reviewFiles = parsedDiff.kind === "files" ? parsedDiff.files : [];
   const fileVisibility = useReviewFileVisibility({
@@ -469,6 +485,7 @@ export function ReviewSheet(props: ReviewSheetProps) {
 
   const handleSelectFile = useCallback(
     (fileId: string | null) => {
+      loadVisibleFile(fileId, true);
       commentSelection.clearSelection();
       if (fileId !== null && collapsedFileIds.includes(fileId)) {
         toggleExpandedFile(fileId);
@@ -481,13 +498,14 @@ export function ReviewSheet(props: ReviewSheetProps) {
         console.error("[review] Failed to navigate to diff file", error);
       });
     },
-    [collapsedFileIds, commentSelection, toggleExpandedFile],
+    [collapsedFileIds, commentSelection, toggleExpandedFile, loadVisibleFile],
   );
   const handleVisibleFileChange = useCallback(
     (event: NativeSyntheticEvent<{ readonly fileId?: string | null }>) => {
+      loadVisibleFile(event.nativeEvent.fileId ?? null);
       reviewFileNavigatorRef.current?.setVisibleFile(event.nativeEvent.fileId ?? null);
     },
-    [],
+    [loadVisibleFile],
   );
   const renderInspector = useCallback(
     () => (
@@ -508,10 +526,11 @@ export function ReviewSheet(props: ReviewSheetProps) {
     (event: NativeSyntheticEvent<{ readonly fileId?: string }>) => {
       const { fileId } = event.nativeEvent;
       if (fileId) {
+        loadVisibleFile(fileId, true);
         toggleExpandedFile(fileId);
       }
     },
-    [toggleExpandedFile],
+    [toggleExpandedFile, loadVisibleFile],
   );
 
   const handleNativeToggleViewedFile = useCallback(
@@ -818,7 +837,7 @@ export function ReviewSheet(props: ReviewSheetProps) {
                 <NativeReviewDiffView
                   collapsable={false}
                   testID="review-native-diff-view"
-                  refreshing={isPullRefreshing}
+                  refreshing={isPullRefreshing || isSelectedSectionPending || areFilePatchesPending}
                   onPullToRefresh={() => void handlePullToRefresh()}
                   style={StyleSheet.absoluteFill}
                   appearanceScheme={selectedTheme}
@@ -862,7 +881,7 @@ export function ReviewSheet(props: ReviewSheetProps) {
               // iOS has no other refresh affordance here (the explicit
               // "Refresh current diff" menu is Android-only).
               <RefreshControl
-                refreshing={isPullRefreshing}
+                refreshing={isPullRefreshing || isSelectedSectionPending || areFilePatchesPending}
                 onRefresh={() => void handlePullToRefresh()}
               />
             }

apps/mobile/src/features/review/nativeReviewDiffAdapter.ts

@@ -244,6 +244,7 @@ function createNoticeRow(fileId: string, suffix: string, text: string): NativeRe
 }
 
 function noticeRowsForFile(file: ReviewRenderableFile): ReadonlyArray<NativeReviewDiffRow> {
+  if (file.notice) return [createNoticeRow(file.id, "loading", file.notice)];
   if (file.rows.length > 0) {
     return [];
   }

apps/mobile/src/features/review/reviewModel.test.ts

@@ -8,6 +8,7 @@ import {
 } from "@t3tools/contracts";
 
 import {
+  applyReviewDiffMetadata,
   buildReviewParsedDiff,
   buildReviewSectionItems,
   getDefaultReviewSectionId,
@@ -271,3 +272,34 @@ describe("buildReviewParsedDiff", () => {
     });
   });
 });
+
+describe("applyReviewDiffMetadata", () => {
+  it("uses complete counts even when the preview contains only part of one file", () => {
+    const parsed = buildReviewParsedDiff(
+      [
+        "diff --git a/large.txt b/large.txt",
+        "--- a/large.txt",
+        "+++ b/large.txt",
+        "@@ -1 +1 @@",
+        "-before",
+        "+after",
+      ].join("\n"),
+      "partial",
+    );
+    const result = applyReviewDiffMetadata(parsed, {
+      truncated: true,
+      files: [
+        { path: "large.txt", previousPath: null, additions: 4000, deletions: 3000 },
+        { path: "unseen.txt", previousPath: null, additions: 100, deletions: 20 },
+      ],
+    });
+    expect(result.kind).toBe("files");
+    if (result.kind !== "files") return;
+    expect(result.fileCount).toBe(2);
+    expect(result.additions).toBe(4100);
+    expect(result.deletions).toBe(3020);
+    expect(result.files[0]?.additions).toBe(4000);
+    expect(result.notice).toContain("Counts include all changes");
+    expect(applyReviewDiffMetadata(parsed, null)).toEqual(parsed);
+  });
+});

apps/mobile/src/features/review/reviewModel.ts

@@ -18,6 +18,9 @@ export interface ReviewSectionItem {
   readonly subtitle: string | null;
   readonly diff: string | null;
   readonly isLoading: boolean;
+  readonly files?: ReviewDiffPreviewSource["files"];
+  readonly truncated?: boolean;
+  readonly source?: ReviewDiffPreviewSource;
 }
 
 export interface ReviewRenderableHunkRow {
@@ -47,6 +50,7 @@ export type ReviewRenderableRow = ReviewRenderableHunkRow | ReviewRenderableLine
 export interface ReviewRenderableFile {
   readonly id: string;
   readonly cacheKey: string;
+  readonly notice?: string;
   readonly path: string;
   readonly previousPath: string | null;
   readonly changeType: ChangeTypes;
@@ -442,6 +446,9 @@ export function buildReviewSectionItems(input: {
     title: section.title,
     subtitle: gitSubtitle(section),
     diff: section.diff,
+    source: section,
+    ...(section.files ? { files: section.files } : {}),
+    truncated: section.truncated,
     isLoading: false,
   }));
   const hasDirtyWorktreeItem = gitItems.some((item) => item.id === DIRTY_WORKTREE_SECTION_ID);
@@ -527,3 +534,27 @@ export function buildReviewParsedDiff(
     };
   }
 }
+
+export function applyReviewDiffMetadata(
+  previewDiff: ReviewParsedDiff,
+  selectedSection: Pick<ReviewSectionItem, "files" | "truncated"> | null,
+): ReviewParsedDiff {
+  if (previewDiff.kind === "empty") return previewDiff;
+  const notice = selectedSection?.truncated
+    ? `This preview exceeds the size limit. Changes shown are incomplete.${selectedSection.files ? " Counts include all changes." : ""}`
+    : previewDiff.notice;
+  if (previewDiff.kind !== "files" || !selectedSection?.files) return { ...previewDiff, notice };
+  const totals = selectedSection.files.reduce(
+    (total, file) => ({
+      additions: total.additions + file.additions,
+      deletions: total.deletions + file.deletions,
+    }),
+    { additions: 0, deletions: 0 },
+  );
+  const stats = new Map(selectedSection.files.map((file) => [file.path, file]));
+  const files = previewDiff.files.map((file) => {
+    const stat = stats.get(file.path);
+    return stat ? { ...file, additions: stat.additions, deletions: stat.deletions } : file;
+  });
+  return { ...previewDiff, ...totals, files, fileCount: selectedSection.files.length, notice };
+}