fix(client): pass the thinking preference into ReasoningCompact

`showThinking` is an app-global display preference the group only reads,
and `ToolCallGroup` already receives it from its host. `ReasoningCompact`
still reached for `showThinkingAtom` itself, coupling a grouped thought
to `~/store` and blocking the move to a feature-owned workspace. It
takes the preference as a required prop now, from the value the group
already holds.

client/src/components/Chat/Messages/Content/Parts/Reasoning.tsx

@@ -273,6 +273,10 @@ Reasoning.displayName = 'Reasoning';
 type ReasoningCompactProps = {
   reasoning: string;
   label: string;
+  /** The host's thoughts-visible preference, supplied by the group rather
+   *  than read from the app store, so a grouped thought stays movable with
+   *  the feature that renders it. */
+  showThinking: boolean;
   isAfterTool?: boolean;
   /** True while this is the reasoning part currently streaming. Drives the
    *  collapsed grok-style live peek. */
@@ -287,11 +291,16 @@ type ReasoningCompactProps = {
  * a floating collapse + copy bar inside the rounded content panel.
  */
 export const ReasoningCompact = memo(
-  ({ reasoning, label, isAfterTool = false, isStreaming = false }: ReasoningCompactProps) => {
+  ({
+    reasoning,
+    label,
+    showThinking,
+    isAfterTool = false,
+    isStreaming = false,
+  }: ReasoningCompactProps) => {
     const contentId = useId();
     const localize = useLocalize();
     const fontSize = useAtomValue(fontSizeAtom);
-    const showThinking = useAtomValue(showThinkingAtom);
     const [isExpanded, setIsExpanded] = useState(showThinking);
     const [isBarVisible, setIsBarVisible] = useState(false);
     const [isCopied, setIsCopied] = useState(false);

client/src/components/Chat/Messages/Content/Parts/__tests__/ReasoningCompact.test.tsx

@@ -36,7 +36,7 @@ jest.mock('lucide-react', () => ({
 
 describe('ReasoningCompact', () => {
   it('reveals its own Thoughts chevron instantly on row hover or focus', () => {
-    render(<ReasoningCompact reasoning="A useful thought" label="Thoughts" />);
+    render(<ReasoningCompact reasoning="A useful thought" label="Thoughts" showThinking={false} />);
 
     const button = screen.getByRole('button', { name: 'Thoughts' });
     const chevron = screen.getByTestId('thoughts-chevron');
@@ -55,7 +55,14 @@ describe('ReasoningCompact', () => {
   });
 
   it('removes the extra top margin when Thoughts follows a tool', () => {
-    render(<ReasoningCompact reasoning="A useful thought" label="Thoughts" isAfterTool />);
+    render(
+      <ReasoningCompact
+        reasoning="A useful thought"
+        label="Thoughts"
+        isAfterTool
+        showThinking={false}
+      />,
+    );
 
     const row = screen
       .getByRole('button', { name: 'Thoughts' })
@@ -69,9 +76,27 @@ describe('ReasoningCompact', () => {
     /** Collapsed is the default whenever thoughts are hidden, and a streaming
      *  THINK part re-renders on every delta, so keeping the whole text mounted
      *  behind the invisible panel cost layout work for nothing. */
-    render(<ReasoningCompact reasoning="A long stream of reasoning" label="Thoughts" />);
+    render(
+      <ReasoningCompact
+        reasoning="A long stream of reasoning"
+        label="Thoughts"
+        showThinking={false}
+      />,
+    );
 
     expect(screen.getByRole('button', { name: 'Thoughts' })).toBeInTheDocument();
     expect(screen.queryByText('A long stream of reasoning')).not.toBeInTheDocument();
   });
+
+  it('opens from the host preference rather than the app store', () => {
+    render(
+      <ReasoningCompact
+        reasoning="A long stream of reasoning"
+        label="Thoughts"
+        showThinking={true}
+      />,
+    );
+
+    expect(screen.getByText('A long stream of reasoning')).toBeInTheDocument();
+  });
 });

client/src/components/Chat/Messages/Content/ToolCallGroup.tsx

@@ -672,6 +672,7 @@ export default function ToolCallGroup({
                         key={`reasoning-${idx}`}
                         reasoning={reasoning}
                         label={label}
+                        showThinking={showThinking}
                         isAfterTool={isAfterTool}
                         isStreaming={streaming}
                       />