chore(types): tighten list_filter helpers (no more typing.Any in params) (#537)

The four ANN401 sites in api/filters.py were the last `Any` parameter
types in production code. `_entry_spec(entry)` accepts a list_filter
element whose shape Django doesn't constrain — `object` matches the
defensive isinstance-check pattern more honestly than Any. The three
`_spec_for_*(field)` helpers take a concrete Django model `Field` (which
is already imported), so type them that way.

Co-authored-by: Martin Castro Laminrs <mcastro@laminr.ai>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

django_admin_react/api/filters.py

@@ -60,7 +60,7 @@
 _FK_FILTER_MAX_OPTIONS = 25
 
 
-def _entry_spec(entry: Any) -> tuple[str | None, type | None]:
+def _entry_spec(entry: object) -> tuple[str | None, type | None]:
     """Normalize a `list_filter` entry to ``(field_name, filter_cls)``.
 
     Django accepts entries in three forms:
@@ -124,15 +124,15 @@ def _resolve_field_path(model: type[Model], path: str) -> Field | None:
     return field
 
 
-def _spec_for_boolean(field_name: str, field: Any) -> dict[str, Any]:
+def _spec_for_boolean(field_name: str, field: Field) -> dict[str, Any]:
     return {
         "name": field_name,
         "label": str(getattr(field, "verbose_name", field_name) or field_name).strip(),
         "type": "boolean",
     }
 
 
-def _spec_for_choices(field_name: str, field: Any) -> dict[str, Any]:
+def _spec_for_choices(field_name: str, field: Field) -> dict[str, Any]:
     raw_choices = list(getattr(field, "choices", None) or [])
     return {
         "name": field_name,
@@ -213,7 +213,7 @@ def _spec_for_fk(
     return payload
 
 
-def _spec_for_date(field_name: str, field: Any) -> dict[str, Any]:
+def _spec_for_date(field_name: str, field: Field) -> dict[str, Any]:
     return {
         "name": field_name,
         "label": str(getattr(field, "verbose_name", field_name) or field_name).strip(),