wire ticket status buttons to pql ticket status

Status buttons in the detail view now call pql.tickets.status IPC,
publish a changed event to refresh the sidebar list, and reload the
detail. Disabled for the current status. IPC handler accepts ids as
a list for batch transitions. PqlClient.ticketSetStatus takes
List<String> and joins with comma per pql CLI contract.

Co-Authored-By: Claude <noreply@anthropic.com>

lib/src/pql/client.dart

@@ -8,6 +8,8 @@ library;
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:flutter/foundation.dart';
+
 class PqlException implements Exception {
   const PqlException(this.message, {this.exitCode = 1, this.stderr = ''});
   final String message;
@@ -133,6 +135,10 @@ class PqlClient {
     return _runObject(args);
   }
 
+  Future<List<Map<String, Object?>>> ticketSetStatus(List<String> ids, String status) async {
+    return _runList(['ticket', 'status', ids.join(','), status]);
+  }
+
   Future<List<Map<String, Object?>>> ticketBoard({String? team}) async {
     final args = ['ticket', 'board'];
     if (team != null) args.addAll(['--team', team]);