feat: link PR diff stats to file changes

src/_locales/en/messages.json

@@ -245,6 +245,9 @@
     "message": "$count$ files",
     "placeholders": { "count": { "content": "$1", "example": "5" } }
   },
+  "prDiffStatsLinkHint": {
+    "message": "Click to view file changes"
+  },
   "diffStatsTitle": {
     "message": "$add$ additions, $del$ deletions",
     "placeholders": {

src/_locales/zh_CN/messages.json

@@ -245,6 +245,9 @@
     "message": "$count$ 个文件",
     "placeholders": { "count": { "content": "$1", "example": "5" } }
   },
+  "prDiffStatsLinkHint": {
+    "message": "点击查看文件变更"
+  },
   "diffStatsTitle": {
     "message": "新增 $add$ 行，删除 $del$ 行",
     "placeholders": {

src/_locales/zh_TW/messages.json

@@ -245,6 +245,9 @@
     "message": "$count$ 個檔案",
     "placeholders": { "count": { "content": "$1", "example": "5" } }
   },
+  "prDiffStatsLinkHint": {
+    "message": "點擊查看檔案變更"
+  },
   "diffStatsTitle": {
     "message": "新增 $add$ 行，刪除 $del$ 行",
     "placeholders": {

src/features/pr-diff-stats.test.ts

@@ -50,7 +50,7 @@ describe("injectPRDiffStats", () => {
     expect(badge7.querySelector(".better-github-diff-stats-add")?.textContent).toBe("+1,234");
     expect(badge7.querySelector(".better-github-diff-stats-del")?.textContent).toBe("−56");
     expect(badge7.querySelector(".better-github-diff-stats-files")?.textContent).toBe("3 files");
-    expect(badge7.title).toBe("1,234 additions, 56 deletions across 3 files");
+    expect(badge7.title).toBe("1,234 additions, 56 deletions across 3 files\nClick to view file changes");
 
     // changedFiles === 1 → singular "file".
     const badge8 = document.querySelector("#issue_8 .better-github-diff-stats") as HTMLElement;

src/features/pr-diff-stats.ts

@@ -4,6 +4,7 @@ import { fetchPRDiffStats } from "../lib/github-api";
 import { insertInfoRowItem } from "../lib/info-row";
 import { buildDiffStatsBadge } from "../lib/diff-stats-badge";
 import { clearSkeletons } from "../lib/info-row-skeleton";
+import { t } from "../lib/i18n";
 
 const BADGE_CLASS = "better-github-diff-stats";
 
@@ -32,7 +33,12 @@ export async function injectPRDiffStats(): Promise<void> {
 
       if (row.querySelector(`.${BADGE_CLASS}`)) continue;
 
-      insertInfoRowItem(row, "diff", buildDiffStatsBadge(stat, BADGE_CLASS));
+      const link = document.createElement("a");
+      link.href = `/${info.owner}/${info.repo}/pull/${prNumber}/changes`;
+      const badge = buildDiffStatsBadge(stat, BADGE_CLASS);
+      badge.title += `\n${t("prDiffStatsLinkHint")}`;
+      link.appendChild(badge);
+      insertInfoRowItem(row, "diff", link);
     }
   } finally {
     clearSkeletons("prDiff");