fix: make photo retention and exclusion mutually exclusive

pigway_frame_flow/models.py

@@ -2,7 +2,7 @@ from datetime import datetime
 from enum import StrEnum
 from typing import Annotated, Any, Literal
 
-from pydantic import BaseModel, ConfigDict, Field, model_validator
+from pydantic import BaseModel, ConfigDict, Field, StrictBool, model_validator
 
 from pigway_frame_flow.errors import ErrorCode
 
@@ -504,17 +504,17 @@ class WidgetState(StrictModel):
 
 
 class ImageExclusion(StrictModel):
-    excluded: bool
+    excluded: StrictBool
 
 
 class PhotoPreference(StrictModel):
     item_id: str = Field(min_length=1, max_length=4096)
-    starred: bool | None = None
-    excluded: bool | None = None
+    starred: StrictBool | None = None
+    excluded: StrictBool | None = None
 
 
 class ImageStar(StrictModel):
-    starred: bool
+    starred: StrictBool
 
 
 class AssetBatch(StrictModel):