chore(studio): switch to fai_client_sdk (renamed from fai_dart_sdk)

The Dart SDK package was renamed package: fai_dart_sdk →
fai_client_sdk and the dir + Forgejo repo got a -dart language
suffix per the three SDK families convention in
fai/platform/docs/architecture/sdks.md. Updates the path
dep, dep name, every `package:fai_dart_sdk/...` import, and
the one comment that named the SDK.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/data/flow_output.dart

@@ -6,7 +6,7 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:fai_dart_sdk/fai_dart_sdk.dart' show Payload;
+import 'package:fai_client_sdk/fai_client_sdk.dart' show Payload;
 
 /// One named output of a flow run. Sealed via factory constructors
 /// — callers pattern-match with `switch` on the runtime type to

lib/data/friendly_error.dart

@@ -34,7 +34,7 @@ class FriendlyError {
 FriendlyError friendlyError(Object error, AppLocalizations l) {
   // We deliberately don't import package:grpc here so Studio
   // doesn't have to add it to its own pubspec — the dependency
-  // lives one layer down in fai_dart_sdk. `GrpcError` has a
+  // lives one layer down in fai_client_sdk. `GrpcError` has a
   // stable `.code` (int) and `.message` (String?) shape; we
   // duck-type on those instead of an `is` check.
   final code = _intField(error, 'code');

lib/data/hub.dart

@@ -7,7 +7,7 @@
 
 import 'dart:typed_data';
 
-import 'package:fai_dart_sdk/fai_dart_sdk.dart';
+import 'package:fai_client_sdk/fai_client_sdk.dart';
 import 'package:flutter/widgets.dart';
 import 'package:shared_preferences/shared_preferences.dart';