fix(desktop): queue prompts during context compaction (#69783)

apps/desktop/src/app/chat/composer/hooks/use-composer-submit.test.tsx

@@ -8,10 +8,11 @@ import { useComposerSubmit } from './use-composer-submit'
 interface SubmitHarnessOptions {
   attachments?: ComposerAttachment[]
   busy?: boolean
+  compacting?: boolean
   text?: string
 }
 
-function renderSubmitHook({ attachments = [], busy = false, text = '' }: SubmitHarnessOptions = {}) {
+function renderSubmitHook({ attachments = [], busy = false, compacting = false, text = '' }: SubmitHarnessOptions = {}) {
   const draftRef = { current: text }
   const editor = document.createElement('div')
   editor.dataset.slot = 'composer-rich-input'
@@ -33,6 +34,7 @@ function renderSubmitHook({ attachments = [], busy = false, text = '' }: SubmitH
       activeQueueSessionKeyRef: { current: 'stored-session' },
       attachments,
       busy,
+      compacting,
       clearDraft,
       disabled: false,
       draftRef,
@@ -79,6 +81,23 @@ describe('useComposerSubmit busy-turn routing', () => {
     expect(onSubmit).not.toHaveBeenCalled()
   })
 
+  it('queues a plain-text follow-up while the active turn is compacting', () => {
+    const { hook, onCancel, onSteer, onSubmit, queueCurrentDraft } = renderSubmitHook({
+      busy: true,
+      compacting: true,
+      text: 'wait for the summary'
+    })
+
+    act(() => {
+      hook.result.current.submitDraft()
+    })
+
+    expect(queueCurrentDraft).toHaveBeenCalledTimes(1)
+    expect(onSteer).not.toHaveBeenCalled()
+    expect(onSubmit).not.toHaveBeenCalled()
+    expect(onCancel).not.toHaveBeenCalled()
+  })
+
   it('runs slash commands immediately while busy', async () => {
     const { clearDraft, hook, onCancel, onSteer, onSubmit, queueCurrentDraft } = renderSubmitHook({
       busy: true,

apps/desktop/src/app/chat/composer/hooks/use-composer-submit.ts

@@ -17,6 +17,7 @@ interface UseComposerSubmitArgs {
   activeQueueSessionKeyRef: RefObject<string | null>
   attachments: ComposerAttachment[]
   busy: boolean
+  compacting: boolean
   clearDraft: () => void
   disabled: boolean
   draftRef: RefObject<string>
@@ -51,6 +52,7 @@ export function useComposerSubmit({
   activeQueueSessionKeyRef,
   attachments,
   busy,
+  compacting,
   clearDraft,
   disabled,
   draftRef,
@@ -149,7 +151,7 @@ export function useComposerSubmit({
         triggerHaptic('submit')
         clearDraft()
         dispatchSubmit(text)
-      } else if (!attachments.length && text.trim()) {
+      } else if (!compacting && !attachments.length && text.trim()) {
         // Cursor-style stop-and-correct: interrupt the live turn and redirect
         // it with this text. redirect() preserves the shown reasoning/work; if
         // the turn already ended, steerDraft re-queues so nothing is lost.

apps/desktop/src/app/chat/composer/index.tsx

@@ -11,6 +11,7 @@ import { sanitizeComposerInput } from '@/lib/composer-input-sanitize'
 import { DATA_IMAGE_URL_RE } from '@/lib/embedded-images'
 import { triggerHaptic } from '@/lib/haptics'
 import { cn } from '@/lib/utils'
+import { $compactionActive } from '@/store/compaction'
 import { browseBackward, browseForward, deriveUserHistory, isBrowsingHistory } from '@/store/composer-input-history'
 import { POPOUT_WIDTH_REM } from '@/store/composer-popout'
 import { parkQueuedPrompts, removeQueuedPrompt, unparkQueuedPrompts } from '@/store/composer-queue'
@@ -104,6 +105,7 @@ export function ChatBar({
   // focus-bus key, and awaiting-input edge. Main scope = the legacy globals.
   const scope = useComposerScope()
   const attachments = useStore(scope.attachments.$attachments)
+  const compacting = useStore($compactionActive)
   const scrolledUp = useStore($threadScrolledUp)
   const autoSpeak = useStore($autoSpeakReplies)
   // The turn is parked on the user (clarify / approval / sudo / secret). Esc must
@@ -230,11 +232,15 @@ export function ChatBar({
 
   // Steer only makes sense mid-turn, text-only (the gateway can't carry images
   // into a tool result) and never for a slash command (those execute inline).
-  const canSteer = busy && !!onSteer && attachments.length === 0 && isSteerableText
+  const canSteer = busy && !compacting && !!onSteer && attachments.length === 0 && isSteerableText
 
   // While busy: text redirects the live turn (Cursor-style stop-and-correct),
   // attachments queue for the next turn, an empty composer stops.
-  const busyAction: 'steer' | 'queue' | 'stop' = canSteer ? 'steer' : hasComposerPayload ? 'queue' : 'stop'
+  const busyAction: 'steer' | 'queue' | 'stop' = canSteer
+    ? 'steer'
+    : compacting || hasComposerPayload
+      ? 'queue'
+      : 'stop'
 
   // The submit engine — the orchestration seam where draft + queue meet. Owns
   // the submit decision tree, the send-with-restore primitive, and steer.
@@ -243,6 +249,7 @@ export function ChatBar({
     activeQueueSessionKeyRef,
     attachments,
     busy,
+    compacting,
     clearDraft,
     disabled,
     draftRef,