add decision detail view in context panel via MessageBus

Click a decision card in the sidebar → publishes on
builtin.decisions/selection → detail view loads full record →
context panel activates decisions.detail tab and renders:
- Type dot with tooltip, ID colored by type, domain badge
- Title, date
- Status badge for resolved questions

Same MessageBus pattern as ticket detail.

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

lib/builtin/decisions/src/decision_detail_view.dart

@@ -0,0 +1,139 @@
+import 'dart:async';
+
+import 'package:clide/builtin/decisions/src/decision_colors.dart';
+import 'package:clide/kernel/kernel.dart';
+import 'package:clide/kernel/src/events/message_bus.dart';
+import 'package:clide/widgets/widgets.dart';
+import 'package:flutter/widgets.dart';
+
+class DecisionDetailView extends StatefulWidget {
+  const DecisionDetailView({super.key});
+
+  @override
+  State<DecisionDetailView> createState() => _DecisionDetailViewState();
+}
+
+class _DecisionDetailViewState extends State<DecisionDetailView> {
+  StreamSubscription<Message>? _sub;
+  Map<String, Object?>? _decision;
+  bool _loading = false;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    if (_sub != null) return;
+    final kernel = ClideKernel.of(context);
+    _sub = kernel.messages.subscribe(publisher: 'builtin.decisions', channel: 'selection').listen((msg) {
+      final id = msg.data['id'] as String?;
+      if (id != null) {
+        kernel.panels.activateTab(Slots.contextPanel, 'decisions.detail');
+        unawaited(_load(id));
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _sub?.cancel();
+    super.dispose();
+  }
+
+  Future<void> _load(String id) async {
+    setState(() => _loading = true);
+    final kernel = ClideKernel.of(context);
+    final resp = await kernel.ipc.request('pql.decisions.show', args: {'id': id});
+    if (!mounted) return;
+    setState(() {
+      _loading = false;
+      _decision = resp.ok ? resp.data : null;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_loading) return const Center(child: ClideText('Loading…', muted: true));
+    final d = _decision;
+    if (d == null) return const Padding(padding: EdgeInsets.all(12), child: ClideText('Select a decision to view details.', muted: true));
+
+    final tokens = ClideTheme.of(context).surface;
+    final isDark = ClideTheme.of(context).dark;
+    final typeColors = DecisionTypeColors.forTheme(dark: isDark);
+
+    final id = d['id'] as String? ?? '';
+    final title = d['title'] as String? ?? '';
+    final type = d['type'] as String?;
+    final domain = d['domain'] as String?;
+    final status = d['status'] as String?;
+    final date = d['date'] as String?;
+    final typeColor = typeColors.forType(type);
+
+    return SingleChildScrollView(
+      padding: const EdgeInsets.all(12),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Container(
+            padding: const EdgeInsets.all(12),
+            decoration: BoxDecoration(
+              color: tokens.panelBackground,
+              borderRadius: BorderRadius.circular(4),
+              border: Border.all(color: tokens.panelBorder),
+            ),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Row(
+                  children: [
+                    ClideTooltip(
+                      message: type ?? 'confirmed',
+                      child: Container(width: 10, height: 10, decoration: BoxDecoration(color: typeColor, shape: BoxShape.circle)),
+                    ),
+                    const SizedBox(width: 8),
+                    ClideText(id, fontSize: 13, color: typeColor, fontFamily: clideMonoFamily),
+                    const Spacer(),
+                    if (domain != null)
+                      Container(
+                        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+                        decoration: BoxDecoration(color: tokens.panelBorder, borderRadius: BorderRadius.circular(3)),
+                        child: ClideText(domain, fontSize: 10, color: tokens.globalTextMuted, fontFamily: clideMonoFamily),
+                      ),
+                  ],
+                ),
+                const SizedBox(height: 8),
+                ClideText(title, fontSize: 15, fontWeight: FontWeight.w500),
+                if (date != null) ...[
+                  const SizedBox(height: 6),
+                  ClideText(date, muted: true, fontSize: 12, fontFamily: clideMonoFamily),
+                ],
+                if (status != null && status != 'active') ...[
+                  const SizedBox(height: 8),
+                  _StatusBadge(status: status, tokens: tokens),
+                ],
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _StatusBadge extends StatelessWidget {
+  const _StatusBadge({required this.status, required this.tokens});
+  final String status;
+  final SurfaceTokens tokens;
+
+  @override
+  Widget build(BuildContext context) {
+    final color = switch (status) {
+      'open' => tokens.statusWarning,
+      'resolved' => tokens.statusSuccess,
+      _ => tokens.globalTextMuted,
+    };
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+      decoration: BoxDecoration(color: color.withAlpha(0x30), borderRadius: BorderRadius.circular(3)),
+      child: ClideText(status.toUpperCase(), fontSize: 10, color: color, fontFamily: clideMonoFamily),
+    );
+  }
+}

lib/builtin/decisions/src/decisions_view.dart

@@ -185,6 +185,7 @@ class _DecisionCard extends StatelessWidget {
     return Padding(
       padding: const EdgeInsets.only(bottom: 4),
       child: ClideTappable(
+        onTap: () => ClideKernel.of(context).messages.publish('builtin.decisions', 'selection', {'id': entry.id}),
         builder: (ctx, hovered, _) => Container(
           padding: const EdgeInsets.all(8),
           decoration: BoxDecoration(

lib/builtin/decisions/src/extension.dart

@@ -1,3 +1,4 @@
+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';
@@ -8,7 +9,7 @@ class DecisionsExtension extends ClideExtension {
   @override
   String get title => 'Decisions';
   @override
-  String get version => '0.1.0';
+  String get version => '0.2.0';
   @override
   List<String> get dependsOn => const [];
 
@@ -23,5 +24,12 @@ class DecisionsExtension extends ClideExtension {
           priority: -20,
           build: (_) => const DecisionsView(),
         ),
+        TabContribution(
+          id: 'decisions.detail',
+          slot: Slots.contextPanel,
+          title: 'Decision',
+          priority: -50,
+          build: (_) => const DecisionDetailView(),
+        ),
       ];
 }