clarify deictic target references in follow-up edits

lib/ai/context-memory/target-resolution.ts

@@ -10,6 +10,8 @@ const ORIGINAL_IMAGE_REGEX =
   /(原图|上传图|参考图|最初那张|第一张图|素材图|源图|原始图片|原始那张|我发的那张|上传的那张|原来的图)/i;
 const LATEST_RESULT_REGEX =
   /(上一张|上一轮|刚生成|最新生成|这个结果|该结果|按这个结果|继续在这张|基于这张结果|延续上一次结果|上一版|刚才那张结果|生成的图|生成图|结果图|出图结果|刚出的图|上一张生成图|上一轮结果图|现在这张生成图)/i;
+const DEICTIC_TARGET_REGEX =
+  /(这张图|这只|这个|这款|这套|当前这张|当前这个|当前这只|这一张|这一只|这个产品|这个物体|这只猫|这只狗)/i;
 const SELECTION_REGEX = /(选中的|当前这张|我选的|这几张|这些图|选中图)/i;
 const ACTIONABLE_EDIT_REGEX =
   /(改|调整|优化|换|替换|去掉|抠|重绘|增强|修|处理|按照|按|保留|统一|色差|背景|清晰|风格|亮一点|暗一点|白底|透明底)/i;
@@ -284,6 +286,42 @@ export function resolveTargetAssets(
     });
   }
 
+  if (DEICTIC_TARGET_REGEX.test(text)) {
+    if (selectedRefs.length > 0) {
+      return buildResolvedTargetAssets({
+        targetRefs: selectedRefs,
+        candidateRefs,
+        resolutionMode: "explicit_selection",
+        confidence: 93,
+        needsClarification: false,
+        reason: "用户使用“这张/这只/这个”等指代表达，且当前存在明确选中目标图",
+        fromHistory: true,
+      });
+    }
+
+    if (candidateRefs.length === 1) {
+      return buildResolvedTargetAssets({
+        targetRefs: [candidateRefs[0]],
+        candidateRefs,
+        resolutionMode: "text_reference",
+        confidence: 84,
+        needsClarification: false,
+        reason: "用户使用指代表达，且当前仅有一张候选图",
+        fromHistory: true,
+      });
+    }
+
+    return buildResolvedTargetAssets({
+      targetRefs: [],
+      candidateRefs,
+      resolutionMode: "clarification",
+      confidence: 0,
+      needsClarification: true,
+      reason: "用户使用“这张/这只/这个”等指代表达，但当前没有明确选中唯一目标图",
+      fromHistory: true,
+    });
+  }
+
   if (
     ACTIONABLE_EDIT_REGEX.test(text) &&
     currentRefs.length === 0 &&