feat: add GET /api/workspace/latest-screenshot endpoint

backend.py

@@ -1027,6 +1027,30 @@ async def get_workspace_file(path: str):
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@app.get("/api/workspace/latest-screenshot")
+async def get_latest_screenshot():
+    try:
+        w_path = Path(WORKSPACE_DIR).resolve()
+        png_files = []
+        for p in w_path.rglob("*.png"):
+            if any(part.startswith(".") for part in p.parts):
+                continue
+            try:
+                mtime = p.stat().st_mtime
+                png_files.append((p, mtime))
+            except Exception:
+                pass
+        if not png_files:
+            raise HTTPException(status_code=404, detail="No screenshot found")
+        newest = max(png_files, key=lambda x: x[1])[0]
+        from fastapi.responses import FileResponse
+        return FileResponse(str(newest))
+    except HTTPException as he:
+        raise he
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 # ---------------------------------------------------------------------------
 # Dashboard and Status API
 # ---------------------------------------------------------------------------