Phase 3.1: Remove flutter_bloc + equatable, delete old bloc files

- Remove flutter_bloc and equatable dependencies from both apps
- Delete all 10 old bloc files (5 per app)
- Fix 6 remaining screens that used context.read<ApiClient>() from
  flutter_bloc → converted to ConsumerStatefulWidget/ConsumerWidget
  with ref.read(apiClientProvider)
- Both apps now use Riverpod exclusively for state management

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client_app/lib/features/chat/screens/chat_transcript_screen.dart

@@ -1,18 +1,18 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_bloc/flutter_bloc.dart';
-import '../../../core/api/api_client.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../../../core/api/api_client_provider.dart';
 import '../../../core/constants.dart';
 
-class ChatTranscriptScreen extends StatefulWidget {
+class ChatTranscriptScreen extends ConsumerStatefulWidget {
   final String sessionId;
 
   const ChatTranscriptScreen({super.key, required this.sessionId});
 
   @override
-  State<ChatTranscriptScreen> createState() => _ChatTranscriptScreenState();
+  ConsumerState<ChatTranscriptScreen> createState() => _ChatTranscriptScreenState();
 }
 
-class _ChatTranscriptScreenState extends State<ChatTranscriptScreen> {
+class _ChatTranscriptScreenState extends ConsumerState<ChatTranscriptScreen> {
   List<Map<String, dynamic>> _messages = [];
   List<Map<String, dynamic>> _closures = [];
   bool _loading = true;
@@ -25,7 +25,7 @@ class _ChatTranscriptScreenState extends State<ChatTranscriptScreen> {
 
   Future<void> _loadTranscript() async {
     try {
-      final api = context.read<ApiClient>();
+      final api = ref.read(apiClientProvider);
       final response = await api.get('/api/shared/chat/${widget.sessionId}/transcript');
       final data = response['data'] as Map<String, dynamic>;
       setState(() {