fix: preserve reference frame aspect ratio

web/components/ad-recreation-board.tsx

@@ -3225,8 +3225,8 @@ function SourceSubjectPipeline({
                     alt={`参考帧 ${index + 1}`}
                     label={`参考帧 ${String(index + 1).padStart(2, "0")}`}
                     meta={`${frame.timestamp.toFixed(1)}s`}
-                    className="h-24"
-                    objectFit="cover"
+                    className="aspect-[9/16]"
+                    objectFit="contain"
                     previewObjectFit="contain"
                     previewPlacement="left"
                     previewMaxWidth={320}
@@ -3295,8 +3295,8 @@ function SourceSubjectPipeline({
                   alt={`转换参考 ${index + 1}`}
                   label={`转换参考 ${index + 1}`}
                   meta={`${frame.timestamp.toFixed(1)}s`}
-                  className="h-24"
-                  objectFit="cover"
+                  className="aspect-[9/16]"
+                  objectFit="contain"
                   disablePreview
                   topLeft={<span className="rounded bg-black/72 px-1 font-mono text-[9px] text-white/70">{String(index + 1).padStart(2, "0")}</span>}
                 />