fix: swap server-actions for trpc mutations

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

@@ -23,6 +23,29 @@ export const ZAddSignersMutationSchema = z
 
 export type TAddSignersMutationSchema = z.infer<typeof ZAddSignersMutationSchema>;
 
+export const ZAddTemplateSignersMutationSchema = z
+  .object({
+    templateId: z.number(),
+    signers: z.array(
+      z.object({
+        nativeId: z.number().optional(),
+        email: z.string().email().min(1),
+        name: z.string(),
+      }),
+    ),
+  })
+  .refine(
+    (schema) => {
+      const emails = schema.signers.map((signer) => signer.email.toLowerCase());
+
+      return new Set(emails).size === emails.length;
+    },
+    // Dirty hack to handle errors when .root is populated for an array type
+    { message: 'Signers must have unique emails', path: ['signers__root'] },
+  );
+
+export type TAddTemplateSignersMutationSchema = z.infer<typeof ZAddTemplateSignersMutationSchema>;
+
 export const ZCompleteDocumentWithTokenMutationSchema = z.object({
   token: z.string(),
   documentId: z.number(),