refactor: rename app fai_studio -> chain_studio

Studio is the Ch∆In product's GUI, not a F∆I-vendor app. Rename the
Flutter package, all package: imports, and the build identity across
platforms: linux/windows CMake BINARY_NAME + project, Windows Runner.rc
fields, macOS PRODUCT_NAME / bundle id (ai.flemming.chain.chainStudio) /
.app + scheme BuildableName. Update the client-SDK + flow-editor deps to
their renamed chain_* packages (path + git URL). Company/copyright fields
now read Flemming.AI. flutter analyze: clean.

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_client_sdk/fai_client_sdk.dart' show Payload;
+import 'package:chain_client_sdk/chain_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/flow_run_driver.dart

@@ -13,7 +13,7 @@
 import 'dart:async';
 import 'dart:typed_data';
 
-import 'package:fai_studio_flow_editor/fai_studio_flow_editor.dart' as editor;
+import 'package:chain_studio_flow_editor/chain_studio_flow_editor.dart' as editor;
 
 import 'hub.dart';
 

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_client_sdk. `GrpcError` has a
+  // lives one layer down in chain_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_client_sdk/fai_client_sdk.dart';
+import 'package:chain_client_sdk/chain_client_sdk.dart';
 import 'package:flutter/widgets.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 

lib/pages/flows.dart

@@ -1,5 +1,5 @@
 // FlowsPage — Studio's flow surface. Thin host wrapper around
-// the swappable fai_studio_flow_editor package: loads the
+// the swappable chain_studio_flow_editor package: loads the
 // hub's installed capabilities, hands them + a Studio-side
 // FlowRunDriver to the editor, and lets the editor own
 // everything else (file list, three-tab body, properties
@@ -10,7 +10,7 @@
 // package so a swap is one pubspec change — Studio doesn't
 // need to know what's inside the editor any more.
 
-import 'package:fai_studio_flow_editor/fai_studio_flow_editor.dart';
+import 'package:chain_studio_flow_editor/chain_studio_flow_editor.dart';
 import 'package:flutter/material.dart';
 
 import '../data/flow_run_driver.dart';

lib/widgets/fai_settings_dialog.dart

@@ -2,7 +2,7 @@
 // Reads current values from HubService, persists on save via
 // HubService.reconnect.
 
-import 'package:fai_client_sdk/fai_client_sdk.dart';
+import 'package:chain_client_sdk/chain_client_sdk.dart';
 import 'package:flutter/material.dart';
 
 import '../data/error_presentation.dart';