fix: dateformat bug (#1372)

## Description

It used the wrong property for finding the document's dateFormat in the
`DATE_FORMATS` array.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Improved date format selection in the settings form to ensure accurate
formatting based on value.
- Default timezone now automatically set to the user's local timezone
for better user experience.

- **Bug Fixes**
- Corrected initialization of the timezone field to enhance form
accuracy.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/ui/primitives/document-flow/add-settings.tsx

@@ -95,7 +95,7 @@ export const AddSettingsFormPartial = ({
           TIME_ZONES.find((timezone) => timezone === document.documentMeta?.timezone) ??
           DEFAULT_DOCUMENT_TIME_ZONE,
         dateFormat:
-          DATE_FORMATS.find((format) => format.label === document.documentMeta?.dateFormat)
+          DATE_FORMATS.find((format) => format.value === document.documentMeta?.dateFormat)
             ?.value ?? DEFAULT_DOCUMENT_DATE_FORMAT,
         redirectUrl: document.documentMeta?.redirectUrl ?? '',
       },