fix(server): ensure .actionable throws Next.js errors (#452)

Close #450

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

## Summary by CodeRabbit

- **Bug Fixes**
- Improved error handling to ensure specific Next.js navigation errors
are re-thrown instead of being handled internally.

- **Tests**
- Added new tests to verify correct behavior when specific Next.js
navigation errors occur.

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

Author: unnoq

packages/server/package.json

@@ -66,6 +66,7 @@
     "@orpc/standard-server-node": "workspace:*"
   },
   "devDependencies": {
+    "next": "^15.3.0",
     "supertest": "^7.1.0"
   }
 }

packages/server/src/procedure-action.test.ts

@@ -1,4 +1,5 @@
 import { ORPCError } from '@orpc/client'
+import { forbidden, notFound, redirect, unauthorized } from 'next/navigation'
 import { createActionableClient } from './procedure-action'
 
 describe('createActionableClient', () => {
@@ -34,4 +35,19 @@ describe('createActionableClient', () => {
     expect(result).toEqual([null, '__mocked__'])
     expect(client).toHaveBeenCalledWith('input')
   })
+
+  it.each([
+    [() => redirect('/foo')],
+    [() => forbidden()],
+    [() => unauthorized()],
+    [() => notFound()],
+  ])('should rethrow next.js error', async (error) => {
+    (process as any).env.__NEXT_EXPERIMENTAL_AUTH_INTERRUPTS = true
+
+    client.mockImplementationOnce(() => {
+      error()
+    })
+
+    await expect(action('input')).rejects.toThrowError()
+  })
 })

packages/server/src/procedure-action.ts

@@ -35,6 +35,15 @@ export function createActionableClient<TInput, TOutput, TError>(
       return [null, await client(input)]
     }
     catch (error) {
+      if (
+        error instanceof Error
+        && 'digest' in error
+        && typeof error.digest === 'string'
+        && error.digest.startsWith('NEXT_')
+      ) {
+        throw error
+      }
+
       return [toORPCError(error).toJSON(), undefined]
     }
   }