feat: add tests and compose

backend/uframe/parser.py

@@ -294,8 +294,13 @@ def _parse_line(keyword: str, args: list[str], line_num: int) -> IRNode:
     elif keyword == "sparkline":
         label = args[0] if args else ""
         vals_str = args[1] if len(args) > 1 else ""
-        values = [float(v) for v in vals_str.split(",") if v.strip()] if vals_str else []
-        width = int(args[2]) if len(args) > 2 else 20
+        values: list[float] = []
+        if vals_str and "$" not in vals_str:
+            values = [float(v) for v in vals_str.split(",") if v.strip()]
+        try:
+            width = int(args[2]) if len(args) > 2 else 20
+        except ValueError:
+            width = 20
         return Sparkline(label=label, values=values, spark_width=width,
                          source_line=line_num)