fix(tui): keep stream cadence responsive while typing

ui-tui/src/app/scroll.ts

@@ -1,7 +1,6 @@
 import type { ScrollBoxHandle } from '@hermes/ink'
 
 import type { SelectionApi } from './interfaces.js'
-import { markScrolling } from './interactionMode.js'
 
 export interface SelectionSnap {
   anchor?: { row: number } | null
@@ -30,8 +29,6 @@ export function scrollWithSelectionBy(delta: number, { scrollRef, selection }: S
     return
   }
 
-  markScrolling()
-
   const sel = selection.getState() as null | SelectionSnap
   const top = s.getViewportTop()
   const bottom = top + viewport - 1

ui-tui/src/app/turnController.ts

@@ -2,7 +2,6 @@ import {
   REASONING_PULSE_MS,
   STREAM_BATCH_MS,
   STREAM_IDLE_BATCH_MS,
-  STREAM_SCROLLING_BATCH_MS,
   STREAM_TYPING_BATCH_MS
 } from '../config/timing.js'
 import type { SessionInterruptResponse, SubagentEventPayload } from '../gatewayTypes.js'
@@ -16,7 +15,6 @@ import {
 } from '../lib/text.js'
 import type { ActiveTool, ActivityItem, Msg, SubagentProgress } from '../types.js'
 
-import { getInteractionMode } from './interactionMode.js'
 import { resetFlowOverlays } from './overlayStore.js'
 import { pushSnapshot } from './spawnHistoryStore.js'
 import { getTurnState, patchTurnState, resetTurnState } from './turnStore.js'
@@ -504,15 +502,12 @@ class TurnController {
       return
     }
 
-    const interaction = getInteractionMode()
-    const delay = interaction === 'scrolling' ? STREAM_SCROLLING_BATCH_MS : interaction === 'typing' ? STREAM_TYPING_BATCH_MS : this.streamDelay
-
     this.streamTimer = setTimeout(() => {
       this.streamTimer = null
       const raw = this.bufRef.trimStart()
       const visible = hasReasoningTag(raw) ? splitReasoning(raw).text : raw
       patchTurnState({ streaming: visible })
-    }, delay)
+    }, this.streamDelay)
   }
 
   startMessage() {

ui-tui/src/app/useSubmission.ts

@@ -1,5 +1,6 @@
 import { type MutableRefObject, useCallback, useEffect, useRef } from 'react'
 
+import { TYPING_IDLE_MS } from '../config/timing.js'
 import { attachedImageNotice } from '../domain/messages.js'
 import { looksLikeSlashCommand } from '../domain/slash.js'
 import type { GatewayClient } from '../gatewayClient.js'
@@ -10,7 +11,6 @@ import { PASTE_SNIPPET_RE } from '../protocol/paste.js'
 import type { Msg } from '../types.js'
 
 import type { ComposerActions, ComposerRefs, ComposerState, PasteSnippet } from './interfaces.js'
-import { markTyping } from './interactionMode.js'
 import { turnController } from './turnController.js'
 import { getUiState, patchUiState } from './uiStore.js'
 
@@ -48,13 +48,28 @@ export function useSubmission(opts: UseSubmissionOptions) {
   } = opts
 
   const lastEmptyAt = useRef(0)
+  const typingIdleTimer = useRef<ReturnType<typeof setTimeout> | null>(null)
 
   useEffect(() => {
     if (composerState.input || composerState.inputBuf.length) {
-      markTyping()
       if (getUiState().busy) {
         turnController.boostStreamingForTyping()
       }
+
+      if (typingIdleTimer.current) {
+        clearTimeout(typingIdleTimer.current)
+      }
+
+      typingIdleTimer.current = setTimeout(() => {
+        typingIdleTimer.current = null
+        turnController.relaxStreaming()
+      }, TYPING_IDLE_MS)
+    }
+
+    return () => {
+      if (typingIdleTimer.current) {
+        clearTimeout(typingIdleTimer.current)
+      }
     }
   }, [composerState.input, composerState.inputBuf])
 

ui-tui/src/config/timing.ts

@@ -1,7 +1,6 @@
 export const STREAM_BATCH_MS = 16
 export const STREAM_IDLE_BATCH_MS = 16
-export const STREAM_SCROLLING_BATCH_MS = 250
-export const STREAM_TYPING_BATCH_MS = 120
+export const STREAM_TYPING_BATCH_MS = 80
 export const TYPING_IDLE_MS = 250
 export const SCROLLING_IDLE_MS = 450
 export const REASONING_PULSE_MS = 700