Fix assistant artifact toggle overlap

lib/features/assistant/assistant_page.dart

@@ -34,6 +34,7 @@ const double _assistantHorizontalPaneGap = 2;
 const double _assistantVerticalResizeHandleHeight = 10;
 const double _assistantArtifactPaneMinWidth = 280;
 const double _assistantArtifactPaneDefaultWidth = 360;
+const double _assistantCollapsedArtifactToggleClearance = 56;
 
 typedef AssistantClipboardImageReader = Future<XFile?> Function();
 
@@ -446,6 +447,9 @@ class _AssistantPageState extends State<AssistantPage> {
                   currentTask: currentTask,
                   items: timelineItems,
                   messageViewMode: controller.currentAssistantMessageViewMode,
+                  topTrailingInset: _artifactPaneCollapsed
+                      ? _assistantCollapsedArtifactToggleClearance
+                      : 0,
                   scrollController: _conversationController,
                   onOpenDetail: widget.onOpenDetail,
                   onFocusComposer: _focusComposer,
@@ -605,8 +609,8 @@ class _AssistantPageState extends State<AssistantPage> {
             Positioned.fill(child: panel),
             if (_artifactPaneCollapsed)
               Positioned(
-                right: AppSpacing.sm,
-                top: AppSpacing.lg,
+                right: 0,
+                top: 0,
                 child: AssistantArtifactSidebarRevealButton(
                   onTap: () {
                     setState(() {
@@ -1819,6 +1823,7 @@ class _ConversationArea extends StatelessWidget {
     required this.currentTask,
     required this.items,
     required this.messageViewMode,
+    required this.topTrailingInset,
     required this.scrollController,
     required this.onOpenDetail,
     required this.onFocusComposer,
@@ -1832,6 +1837,7 @@ class _ConversationArea extends StatelessWidget {
   final _AssistantTaskEntry currentTask;
   final List<_TimelineItem> items;
   final AssistantMessageViewMode messageViewMode;
+  final double topTrailingInset;
   final ScrollController scrollController;
   final ValueChanged<DetailPanelData> onOpenDetail;
   final VoidCallback onFocusComposer;
@@ -1852,7 +1858,7 @@ class _ConversationArea extends StatelessWidget {
       child: Column(
         children: [
           Padding(
-            padding: const EdgeInsets.fromLTRB(10, 8, 10, 8),
+            padding: EdgeInsets.fromLTRB(10, 8, 10 + topTrailingInset, 8),
             child: Row(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [

lib/widgets/assistant_artifact_sidebar.dart

@@ -425,7 +425,10 @@ class AssistantArtifactSidebarRevealButton extends StatelessWidget {
               ],
             ),
             borderRadius: BorderRadius.circular(AppRadius.sidebar),
-            border: Border.all(color: palette.chromeStroke),
+            border: Border.all(
+              color: palette.chromeStroke.withValues(alpha: 0.88),
+              width: 0.9,
+            ),
             boxShadow: [palette.chromeShadowAmbient],
           ),
           child: Icon(

test/features/assistant_page_suite.dart

@@ -266,6 +266,36 @@ void main() {
     expect(find.byKey(const Key('assistant-artifact-pane')), findsNothing);
   });
 
+  testWidgets(
+    'AssistantPage keeps the collapsed artifact toggle clear of top toolbar controls',
+    (WidgetTester tester) async {
+      final controller = await createTestController(tester);
+
+      await pumpPage(
+        tester,
+        child: AssistantPage(controller: controller, onOpenDetail: (_) {}),
+        platform: TargetPlatform.macOS,
+      );
+
+      final toggle = find.byKey(const Key('assistant-artifact-pane-toggle'));
+      final viewMode = find.byKey(
+        const Key('assistant-message-view-mode-button'),
+      );
+      final connectionChip = find.byKey(const Key('assistant-connection-chip'));
+
+      expect(toggle, findsOneWidget);
+      expect(viewMode, findsOneWidget);
+      expect(connectionChip, findsOneWidget);
+
+      final toggleRect = tester.getRect(toggle);
+      final viewModeRect = tester.getRect(viewMode);
+      final connectionRect = tester.getRect(connectionChip);
+
+      expect(toggleRect.overlaps(viewModeRect), isFalse);
+      expect(toggleRect.overlaps(connectionRect), isFalse);
+    },
+  );
+
   testWidgets(
     'AssistantPage shows Single Agent provider selector on the right',
     (WidgetTester tester) async {},
@@ -567,7 +597,9 @@ void main() {
         await _waitForCondition(
           () =>
               controller
-                  .assistantImportedSkillsForSession(controller.currentSessionKey)
+                  .assistantImportedSkillsForSession(
+                    controller.currentSessionKey,
+                  )
                   .length ==
               3,
         );