fix(android): graphql service type error (#12858)

#### PR Dependency Tree


* **PR #12858** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

## Summary by CodeRabbit

- **Refactor**
- Improved consistency in how session data is handled when starting a
Copilot session.

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

packages/frontend/apps/android/App/app/src/main/java/app/affine/pro/service/GraphQLService.kt

@@ -44,7 +44,7 @@ class GraphQLService @Inject constructor() {
     ) = mutation(
         CreateCopilotSessionMutation(
             CreateChatSessionInput(
-                docId = docId,
+                docId = Optional.present(docId),
                 workspaceId = workspaceId,
                 promptName = prompt.value
             )
@@ -132,4 +132,4 @@ class GraphQLService @Inject constructor() {
     companion object {
         private const val ERROR_NULL_SESSION_ID = "null session id."
     }
-}
+}