fix(web): settle shortcut moves to the next thread like the sidebar

apps/web/src/components/ChatView.tsx

@@ -242,6 +242,7 @@ import {
 import { useTheme } from "../hooks/useTheme";
 import { writeTextToClipboard } from "../hooks/useCopyToClipboard";
 import { isCommandPaletteOpen } from "../commandPaletteBus";
+import { settleAndAdvance } from "../settleAndAdvance";
 import { subscribeSnapShotComposerFocus } from "../lib/desktopSnapShot";
 import { useMediaQuery } from "../hooks/useMediaQuery";
 import { useTurnDiffSummaries } from "../hooks/useTurnDiffSummaries";
@@ -8109,6 +8110,8 @@ export default function ChatView(props: ChatViewProps) {
           void handleUnsettleActiveThread();
           return;
         }
+        // Same as the sidebar Settle button: settle, then open the next thread.
+        if (settleAndAdvance(activeThreadRef)) return;
 
         void settleThread(activeThreadRef).then((result) => {
           if (result._tag !== "Failure" || isAtomCommandInterrupted(result)) return;

apps/web/src/components/Sidebar.tsx

@@ -145,6 +145,7 @@ import { useAcknowledgeThreadWoke, useThreadActions } from "../hooks/useThreadAc
 import { useHandleNewThread } from "../hooks/useHandleNewThread";
 import { useTerminalFocus } from "../hooks/useTerminalFocus";
 import { isCommandPaletteOpen, openCommandPalette } from "../commandPaletteBus";
+import { registerSettleAndAdvance } from "../settleAndAdvance";
 import { startNewThreadFromContext } from "../lib/chatThreadActions";
 import { useClientSettings } from "../hooks/useSettings";
 import { useCopyToClipboard } from "../hooks/useCopyToClipboard";
@@ -3454,6 +3455,8 @@ export default function Sidebar() {
     },
     [planForwardNavigation, settleThread],
   );
+  // The thread.settle shortcut parks the open thread through this same path.
+  useEffect(() => registerSettleAndAdvance(attemptSettle), [attemptSettle]);
   // Post-settle navigation must skip threads settling in this same batch —
   // they are all leaving the card block together. Rows that are already
   // explicitly settled are skipped: nothing to do on a valid mixed selection.

apps/web/src/settleAndAdvance.test.ts

@@ -0,0 +1,37 @@
+import { scopeThreadRef } from "@t3tools/client-runtime/environment";
+import { EnvironmentId, ThreadId, type ScopedThreadRef } from "@t3tools/contracts";
+import { describe, expect, it } from "vite-plus/test";
+
+import { registerSettleAndAdvance, settleAndAdvance } from "./settleAndAdvance";
+
+const threadRef = scopeThreadRef(
+  EnvironmentId.make("environment-local"),
+  ThreadId.make("thread-1"),
+);
+
+describe("settleAndAdvance", () => {
+  it("hands the open thread to the mounted sidebar so it can move forward", () => {
+    const settled: ScopedThreadRef[] = [];
+    const unregister = registerSettleAndAdvance((ref) => settled.push(ref));
+
+    expect(settleAndAdvance(threadRef)).toBe(true);
+    expect(settled).toEqual([threadRef]);
+    unregister();
+  });
+
+  it("asks the caller to settle in place when no sidebar is mounted", () => {
+    expect(settleAndAdvance(threadRef)).toBe(false);
+  });
+
+  it("keeps a remounted sidebar's handler when the old one unmounts late", () => {
+    const settledBy: string[] = [];
+    const unregisterOld = registerSettleAndAdvance(() => settledBy.push("old"));
+    const unregisterNew = registerSettleAndAdvance(() => settledBy.push("new"));
+    unregisterOld();
+
+    expect(settleAndAdvance(threadRef)).toBe(true);
+    expect(settledBy).toEqual(["new"]);
+    unregisterNew();
+    expect(settleAndAdvance(threadRef)).toBe(false);
+  });
+});

apps/web/src/settleAndAdvance.ts

@@ -0,0 +1,29 @@
+import type { ScopedThreadRef } from "@t3tools/contracts";
+
+type SettleAndAdvance = (threadRef: ScopedThreadRef) => void;
+
+// Only the mounted thread sidebar knows the card order that picks the next
+// thread, so it registers its settle action here for other entry points.
+let registeredSettleAndAdvance: SettleAndAdvance | null = null;
+
+/**
+ * Called by the thread sidebar while it is mounted. Returns the unregister
+ * function, which leaves a newer registration in place.
+ */
+export function registerSettleAndAdvance(handler: SettleAndAdvance): () => void {
+  registeredSettleAndAdvance = handler;
+  return () => {
+    if (registeredSettleAndAdvance === handler) registeredSettleAndAdvance = null;
+  };
+}
+
+/**
+ * Settles the open thread the way the sidebar Settle button does: settle,
+ * then move to the next thread. Used by the `thread.settle` shortcut.
+ * Returns false when no sidebar is mounted, so the caller settles in place.
+ */
+export function settleAndAdvance(threadRef: ScopedThreadRef): boolean {
+  if (!registeredSettleAndAdvance) return false;
+  registeredSettleAndAdvance(threadRef);
+  return true;
+}