fix: add missing email reply validation (#1934)

## Description

General fixes to the email domain features

Changes made:
- Add "email" validation for "Reply-To email" fields
- Fix issue where you can't remove the "Reply-To" email after it's set
- Fix issue where setting the "Sender email" back to Documenso would
still send using the org/team pref

packages/trpc/server/template-router/schema.ts

@@ -65,7 +65,7 @@ export const ZTemplateMetaUpsertSchema = z.object({
   dateFormat: ZDocumentMetaDateFormatSchema.optional(),
   distributionMethod: ZDocumentMetaDistributionMethodSchema.optional(),
   emailId: z.string().nullish(),
-  emailReplyTo: z.string().nullish(),
+  emailReplyTo: z.string().email().nullish(),
   emailSettings: ZDocumentEmailSettingsSchema.optional(),
   redirectUrl: ZDocumentMetaRedirectUrlSchema.optional(),
   language: ZDocumentMetaLanguageSchema.optional(),