fix: eliminate TOCTOU race in file unlink calls

Author: Quratulain-bilal

src/specify_cli/extensions/__init__.py

@@ -3829,10 +3829,8 @@ def download_extension(
 
     def clear_cache(self):
         """Clear the catalog cache (both legacy and URL-hash-based files)."""
-        if self.cache_file.exists():
-            self.cache_file.unlink()
-        if self.cache_metadata_file.exists():
-            self.cache_metadata_file.unlink()
+        self.cache_file.unlink(missing_ok=True)
+        self.cache_metadata_file.unlink(missing_ok=True)
         # Also clear any per-URL hash-based cache files
         if self.cache_dir.exists():
             for extra_cache in self.cache_dir.glob("catalog-*.json"):

src/specify_cli/integrations/_helpers.py

@@ -121,8 +121,7 @@ def _clear_init_options_for_integration(project_root: Path, integration_key: str
 def _remove_integration_json(project_root: Path) -> None:
     """Remove ``.specify/integration.json`` if it exists."""
     path = project_root / INTEGRATION_JSON
-    if path.exists():
-        path.unlink()
+    path.unlink(missing_ok=True)
 
 
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