Fix ruff issues in chart code

Author: nicosuave

examples/chart_example.py

@@ -88,7 +88,7 @@ def main():
     )
 
     vega_spec = chart_to_vega(chart)
-    print(f"Chart type: Area")
+    print("Chart type: Area")
     print(f"Data points: {len(data)}")
     print(f"Vega spec keys: {list(vega_spec.keys())}")
     print()
@@ -113,7 +113,7 @@ def main():
     )
 
     vega_spec = chart_to_vega(chart)
-    print(f"Chart type: Bar")
+    print("Chart type: Bar")
     print(f"Data points: {len(data)}")
     print(f"Vega spec keys: {list(vega_spec.keys())}")
     print()
@@ -140,9 +140,9 @@ def main():
     )
 
     vega_spec = chart_to_vega(chart)
-    print(f"Chart type: Line (multiple metrics)")
+    print("Chart type: Line (multiple metrics)")
     print(f"Data points: {len(data)}")
-    print(f"Metrics: revenue, order_count")
+    print("Metrics: revenue, order_count")
     print(f"Vega spec keys: {list(vega_spec.keys())}")
     print()
 

sidemantic/mcp_server.py

@@ -392,7 +392,8 @@ def create_chart(
         - metrics: ["orders.total_revenue", "orders.order_count"]
         - chart_type: "line"
     """
-    from sidemantic.charts import chart_to_base64_png, chart_to_vega, create_chart as make_chart
+    from sidemantic.charts import chart_to_base64_png, chart_to_vega
+    from sidemantic.charts import create_chart as make_chart
 
     layer = get_layer()