修复拼图结果页图片预览层级

关卡缩略图改为完整显示，避免生成图被裁切

关卡详情内主图预览支持提高层级，避免被详情弹窗遮挡

补充拼图结果页聚焦测试与 Hermes 踩坑记录

src/components/puzzle-result/PuzzleResultView.test.tsx

@@ -274,6 +274,8 @@ describe('PuzzleResultView', () => {
     const levelImage = screen.getByRole('img', { name: '雨夜猫街' });
     const mediaFrame = levelImage.closest('div.relative');
     expect(mediaFrame?.className).toContain('aspect-[4/3]');
+    expect(levelImage.className).toContain('object-contain');
+    expect(levelImage.className).not.toContain('object-cover');
     expect(mediaFrame?.className).not.toContain(
       'bg-[var(--platform-subpanel-fill)]',
     );
@@ -552,6 +554,7 @@ describe('PuzzleResultView', () => {
     const imagePreviewDialog = screen.getByRole('dialog', {
       name: '查看关卡图片',
     });
+    expect(imagePreviewDialog.parentElement?.className).toContain('z-[150]');
     expect(within(imagePreviewDialog).getByAltText('暖灯猫街')).toBeTruthy();
     fireEvent.click(
       within(imagePreviewDialog).getByRole('button', {

src/components/puzzle-result/PuzzleResultView.tsx

@@ -724,6 +724,7 @@ function PuzzleLevelDetailDialog({
             promptReferenceImages={promptReferenceImages}
             promptReferenceLimit={PUZZLE_LEVEL_PROMPT_REFERENCE_LIMIT}
             imageLimitHint="图片≤6MB"
+            mainImagePreviewZIndexClassName="z-[150]"
             imageModelPicker={
               <PuzzleImageModelPicker
                 value={imageModel}
@@ -1069,6 +1070,7 @@ function PuzzleLevelListTab({
                   fallbackLabel="暂无正式图"
                   aspect="standard"
                   surface="none"
+                  imageClassName="h-full w-full object-contain"
                   className="rounded-none"
                   fallbackClassName="tracking-normal text-[var(--platform-text-soft)]"
                   previewOverlay={