fix(tui): restore thinking spinner (#29765)

packages/opencode/src/cli/cmd/tui/feature-plugins/system/session-v2.tsx

@@ -442,16 +442,25 @@ function ReasoningHeader(props: { toggleable: boolean; open: boolean; done: bool
       : theme.warning
 
   return (
+    <Switch>
+      <Match when={!props.done}>
+        <box flexDirection="row">
+          <Spinner color={fg()}>{props.title ? "Thinking: " + props.title : "Thinking"}</Spinner>
+        </box>
+      </Match>
+      <Match when={true}>
         <text fg={fg()} wrapMode="none">
           <Show when={props.toggleable}>
             <span>{props.open ? "- " : "+ "}</span>
           </Show>
-      <span>{props.done ? "Thought" : "Thinking"}</span>
+          <span>Thought</span>
           <Show when={props.title}>
             <span>: </span>
             <span>{props.title}</span>
           </Show>
         </text>
+      </Match>
+    </Switch>
   )
 }
 

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -1595,11 +1595,18 @@ function ReasoningHeader(props: {
       : theme.warning
 
   return (
+    <Switch>
+      <Match when={!props.done}>
+        <box flexDirection="row">
+          <Spinner color={fg()}>{props.title ? "Thinking: " + props.title : "Thinking"}</Spinner>
+        </box>
+      </Match>
+      <Match when={true}>
         <text fg={fg()} wrapMode="none">
           <Show when={props.toggleable}>
             <span>{props.open ? "- " : "+ "}</span>
           </Show>
-      <span>{props.done ? "Thought" : "Thinking"}</span>
+          <span>Thought</span>
           <Show when={props.title || props.duration}>
             <span>: </span>
           </Show>
@@ -1613,6 +1620,8 @@ function ReasoningHeader(props: {
             </span>
           </Show>
         </text>
+      </Match>
+    </Switch>
   )
 }