done React: form field viewing (Widget annotations) with saving issues fixed

gateway/app/routers/edits.py

@@ -168,6 +168,17 @@ class PageReorderOperation(BaseModel):
     data: PageReorderData
 
 
+class UpdateFieldData(BaseModel):
+    value: str | bool
+
+
+class UpdateFieldOperation(BaseModel):
+    id: str
+    type: Literal["update_field"]
+    pageIndex: int
+    data: UpdateFieldData
+
+
 EditOperation = Annotated[
     TextOverlayOperation
     | RedactionOperation
@@ -178,7 +189,8 @@ EditOperation = Annotated[
     | FreehandOperation
     | PageRotationOperation
     | PageDeletionOperation
-    | PageReorderOperation,
+    | PageReorderOperation
+    | UpdateFieldOperation,
     Field(discriminator="type"),
 ]
 
@@ -214,7 +226,8 @@ def apply_edits_impl(document_id: str, request: EditsRequest):
                     import os
                     import tempfile
 
-                    from PIL import Image
+                    # pyrefly: ignore [missing-import]
+                    from PIL import Image   
 
                     # Remove data URI header if present
                     if "," in img_data_str: