fix: suppress metadata polling timeout from Bugsnag notifications

Replace IllegalStateException with GetIntentMetadataError.Timeout so
the expected polling timeout is treated as a non-notifiable server error.

Author: bmc08gt

services/opencode/src/main/kotlin/com/getcode/opencode/controllers/TransactionController.kt

@@ -399,7 +399,7 @@ class TransactionController @Inject constructor(
             .map { Result.success(it) }
             .catch { emit(Result.failure(it)) }
             .firstOrNull()
-            ?: Result.failure(IllegalStateException("Never received the desired metadata"))
+            ?: Result.failure(GetIntentMetadataError.Timeout())
     }
 
     override suspend fun checkWithdrawalAvailability(

services/opencode/src/main/kotlin/com/getcode/opencode/model/core/errors/Errors.kt

@@ -162,6 +162,7 @@ sealed class GetIntentMetadataError(
 ) : CodeServerError(message, cause) {
     class NotFound : GetIntentMetadataError("Not found")
     class Denied : GetIntentMetadataError("Denied")
+    class Timeout : GetIntentMetadataError("Never received the desired metadata")
     class Unrecognized : GetIntentMetadataError("Unrecognized"), NotifiableError
     data class Other(override val cause: Throwable? = null) : GetIntentMetadataError(message = cause?.message, cause = cause), NotifiableError
 }