feat: document file conversion

packages/lib/types/document.ts

@@ -51,6 +51,7 @@ export const ZDocumentSchema = LegacyDocumentSchema.pick({
     id: true,
     data: true,
     initialData: true,
+    originalMimeType: true,
   }).extend({
     envelopeItemId: z.string(),
   }),

packages/lib/types/template.ts

@@ -45,6 +45,7 @@ export const ZTemplateSchema = TemplateSchema.pick({
     id: true,
     data: true,
     initialData: true,
+    originalMimeType: true,
   }).extend({
     envelopeItemId: z.string(),
   }),