fix: ensure paths are normalised in Puya source maps

src/puya/ussemble/debug.py

@@ -1,4 +1,5 @@
 from collections.abc import Mapping, Sequence
+from pathlib import Path
 
 from puya.models import DebugEvent, DebugInfo
 from puya.parse import SourceLocation
@@ -28,7 +29,7 @@ def build_debug_info(
         pc - pc_offset: node.source_location for pc, node in pc_ops.items() if pc >= pc_offset
     }
 
-    files = sorted(map(str, {s.file for s in source_map.values() if s and s.file}))
+    files = sorted(map(_normalize_path, {s.file for s in source_map.values() if s and s.file}))
     mappings = _get_src_mappings(source_map, files)
 
     return DebugInfo(
@@ -40,6 +41,10 @@ def build_debug_info(
     )
 
 
+def _normalize_path(path: Path) -> str:
+    return str(path).replace("\\", "/")
+
+
 def _get_src_mappings(
     source_map: Mapping[int, SourceLocation | None],
     files: Sequence[str],