fix: remove unused imports and simplify _is_user_file return

Author: sohil-kshirsagar

drift/core/communication/types.py

@@ -43,10 +43,7 @@
 from typing import Any
 
 from tusk.drift.core.v1 import (
-    BranchInfo,
     CliMessage,
-    CoverageSnapshotResponse,
-    FileCoverageData,
     InstrumentationVersionMismatchAlert,
     MessageType,
     Runtime,

drift/core/coverage_server.py

@@ -151,9 +151,7 @@ def _is_user_file(filename: str) -> bool:
     # Resolve symlinks for consistent path comparison
     resolved = os.path.realpath(filename)
     # Use trailing separator to avoid prefix collisions (/app matching /application)
-    if _source_root and not (resolved.startswith(_source_root + os.sep) or resolved == _source_root):
-        return False
-    return True
+    return not _source_root or resolved.startswith(_source_root + os.sep) or resolved == _source_root
 
 
 def _get_branch_data(data, filename: str) -> dict: