test(frontend): e2e main flow (login→shelf→cbz→bookmark→logout) + axe scans

frontend/src/index.css

@@ -16,7 +16,7 @@
   --secondary: oklch(0.95 0.003 80);
   --secondary-foreground: oklch(0.32 0.01 70);
   --muted: oklch(0.95 0.003 80);
-  --muted-foreground: oklch(0.55 0.008 70);
+  --muted-foreground: oklch(0.52 0.008 70);
   --accent: oklch(0.68 0.16 46);
   --accent-strong: oklch(0.55 0.17 46);
   --accent-foreground: oklch(0.985 0.002 80);

frontend/src/readers/CbzReader.tsx

@@ -312,6 +312,8 @@ export default function CbzReader({ book, initialLocator, initialPercent, chrome
     >
       <div
         ref={attachBox}
+        // eslint-disable-next-line jsx-a11y/no-noninteractive-tabindex -- 滚动容器须可聚焦(axe scrollable-region-focusable,键盘滚动可达);div 无交互语义属滚动区可聚焦的通行做法
+        tabIndex={0}
         onScroll={onScroll}
         onClick={onZoneClick}
         onPointerDown={(e) => {