Parse single-line gcode for SVG preview

app.py

@@ -268,11 +268,13 @@ def gcode_to_svg(gcode: str) -> str:
     x, y = 0.0, 0.0
     pen_down = False
 
+    # Split on newlines OR command boundaries (for single-line gcode)
     lines = []
-    for line in gcode.split("\n"):
+    for line in gcode.replace(";", "\n;").split("\n"):
         line = line.strip()
         if not line:
             continue
+        # Split on G/M commands
         parts = re.split(r'(?=[GM]\d)', line)
         for part in parts:
             part = part.strip()