Add Heartwood translation layer for file diffs

Co-authored-by: xphoniex <dj.2dixx@gmail.com>
Signed-off-by: Rūdolfs Ošiņš <rudolfs@osins.org>

src/lib/commit.ts

@@ -1,5 +1,5 @@
 import type { Stats, Person } from "@app/lib/project";
-import type { Diff } from "@app/lib/diff";
+import type { Diff, DiffStats } from "@app/lib/diff";
 import { ApiError } from "@app/lib/api";
 import { getDaysPassed } from "@app/lib/utils";
 
@@ -63,11 +63,6 @@ export interface WeeklyActivity {
   week: number;
 }
 
-export interface DiffStats {
-  additions: number;
-  deletions: number;
-}
-
 export interface Commit {
   header: CommitHeader;
   stats: DiffStats;