fix tab switching on selection, tickets first in sidebar

Extension listens to its own selection channel and activates the
detail tab in the context panel — fixes the chicken-and-egg where
the controller only subscribes after the widget builds. Registration
order in main.dart now determines sidebar icon rail order: tickets
first, then decisions, files, git, pql, problems.

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

lib/builtin/decisions/src/extension.dart

@@ -1,7 +1,10 @@
+import 'dart:async';
+
 import 'package:clide/builtin/decisions/src/decision_detail_view.dart';
 import 'package:clide/builtin/decisions/src/decisions_view.dart';
 import 'package:clide/extension/extension.dart';
 import 'package:clide/kernel/kernel.dart';
+import 'package:clide/kernel/src/events/message_bus.dart';
 import 'package:clide/widgets/widgets.dart';
 
 class DecisionsExtension extends ClideExtension {
@@ -10,10 +13,22 @@ class DecisionsExtension extends ClideExtension {
   @override
   String get title => 'Decisions';
   @override
-  String get version => '0.5.0';
+  String get version => '0.6.0';
   @override
   List<String> get dependsOn => const [];
 
+  StreamSubscription<Message>? _sub;
+
+  @override
+  Future<void> activate(ClideExtensionContext ctx) async {
+    _sub = ctx.messages.subscribe(publisher: id, channel: 'selection').listen((_) {
+      ctx.panels.activateTab(Slots.contextPanel, 'decisions.detail');
+    });
+  }
+
+  @override
+  Future<void> deactivate() async => _sub?.cancel();
+
   @override
   List<ContributionPoint> get contributions => [
         TabContribution(

lib/builtin/tickets/src/extension.dart

@@ -1,7 +1,10 @@
+import 'dart:async';
+
 import 'package:clide/builtin/tickets/src/ticket_detail_view.dart';
 import 'package:clide/builtin/tickets/src/tickets_view.dart';
 import 'package:clide/extension/extension.dart';
 import 'package:clide/kernel/kernel.dart';
+import 'package:clide/kernel/src/events/message_bus.dart';
 import 'package:clide/widgets/widgets.dart';
 
 class TicketsExtension extends ClideExtension {
@@ -10,10 +13,22 @@ class TicketsExtension extends ClideExtension {
   @override
   String get title => 'Tickets';
   @override
-  String get version => '0.5.0';
+  String get version => '0.6.0';
   @override
   List<String> get dependsOn => const [];
 
+  StreamSubscription<Message>? _sub;
+
+  @override
+  Future<void> activate(ClideExtensionContext ctx) async {
+    _sub = ctx.messages.subscribe(publisher: id, channel: 'selection').listen((_) {
+      ctx.panels.activateTab(Slots.contextPanel, 'tickets.detail');
+    });
+  }
+
+  @override
+  Future<void> deactivate() async => _sub?.cancel();
+
   @override
   List<ContributionPoint> get contributions => [
         TabContribution(

lib/main.dart

@@ -81,29 +81,35 @@ Future<void> main() async {
   // Register every built-in. Tier 0 activates only the four that do
   // real work; the rest compile in as stubs so the extensions-ui can
   // list them when Tier 6 lands.
+  // Registration order = default icon rail order (left to right).
+  // User can override via project.layout.sidebar.order in settings.
   services.extensions
     ..register(DefaultLayoutExtension())
     ..register(WelcomeExtension())
     ..register(IpcStatusExtension())
     ..register(ThemePickerExtension())
-    ..register(ClaudeExtension())
-    ..register(TerminalExtension())
+    // Sidebar: tickets first, then decisions, files, git, pql, problems
+    ..register(TicketsExtension())
+    ..register(DecisionsExtension())
     ..register(FilesExtension())
-    ..register(EditorExtension())
-    ..register(GrammarsCoreExtension())
-    ..register(MarkdownExtension())
-    ..register(DiffExtension())
     ..register(GitExtension())
     ..register(PqlExtension())
-    ..register(TodosExtension())
     ..register(ProblemsExtension())
+    // Workspace
+    ..register(ClaudeExtension())
+    ..register(TerminalExtension())
+    ..register(EditorExtension())
+    ..register(DiffExtension())
+    // Format engines + stubs
+    ..register(GrammarsCoreExtension())
+    ..register(MarkdownExtension())
+    ..register(TodosExtension())
     ..register(CanvasExtension())
     ..register(GraphExtension())
+    // UI extensions
     ..register(SettingsUiExtension())
     ..register(ExtensionsUiExtension())
     ..register(KeybindingsUiExtension())
-    ..register(DecisionsExtension())
-    ..register(TicketsExtension())
     ..register(ClaudeControlExtension());
 
   await services.extensions.activateAll();