fix(tui): recover from stuck paste mode

Prevent unterminated bracketed paste input from swallowing future keystrokes, and avoid rendering an empty Thinking panel before reasoning arrives.

ui-tui/packages/hermes-ink/src/ink/components/App.tsx

@@ -1,4 +1,4 @@
-import React, { PureComponent, type ReactNode } from 'react'
+import { PureComponent, type ReactNode } from 'react'
 
 import { updateLastInteractionTime } from '../../bootstrap/state.js'
 import { logForDebugging } from '../../utils/debug.js'
@@ -11,13 +11,13 @@ import { InputEvent } from '../events/input-event.js'
 import { TerminalFocusEvent } from '../events/terminal-focus-event.js'
 import {
   INITIAL_STATE,
+  parseMultipleKeypresses,
   type ParsedInput,
   type ParsedKey,
-  type ParsedMouse,
-  parseMultipleKeypresses
+  type ParsedMouse
 } from '../parse-keypress.js'
 import reconciler from '../reconciler.js'
-import { finishSelection, hasSelection, type SelectionState, startSelection } from '../selection.js'
+import { finishSelection, hasSelection, startSelection, type SelectionState } from '../selection.js'
 import { getTerminalFocused, setTerminalFocused } from '../terminal-focus-state.js'
 import { TerminalQuerier, xtversion } from '../terminal-querier.js'
 import { isXtermJs, setXtversionName, supportsExtendedKeys } from '../terminal.js'
@@ -316,8 +316,10 @@ export default class App extends PureComponent<Props, State> {
     // Clear the timer reference
     this.incompleteEscapeTimer = null
 
-    // Only proceed if we have incomplete sequences
-    if (!this.keyParseState.incomplete) {
+    // Only proceed if we have an incomplete escape sequence or an unterminated
+    // bracketed paste. Missing paste-end markers otherwise leave every later
+    // keystroke trapped in the paste buffer.
+    if (!this.keyParseState.incomplete && this.keyParseState.mode !== 'IN_PASTE') {
       return
     }
 
@@ -335,8 +337,8 @@ export default class App extends PureComponent<Props, State> {
       return
     }
 
-    // Process incomplete as a flush operation (input=null)
-    // This reuses all existing parsing logic
+    // Process incomplete/paste state as a flush operation (input=null).
+    // This reuses all existing parsing logic.
     this.processInput(null)
   }
 
@@ -355,8 +357,10 @@ export default class App extends PureComponent<Props, State> {
       reconciler.discreteUpdates(processKeysInBatch, this, keys, undefined, undefined)
     }
 
-    // If we have incomplete escape sequences, set a timer to flush them
-    if (this.keyParseState.incomplete) {
+    // If we have incomplete escape sequences or an unterminated paste, set a
+    // timer to flush/reset them. Paste starts are complete CSI sequences, so
+    // checking only `incomplete` would never arm the watchdog.
+    if (this.keyParseState.incomplete || this.keyParseState.mode === 'IN_PASTE') {
       // Cancel any existing timer first
       if (this.incompleteEscapeTimer) {
         clearTimeout(this.incompleteEscapeTimer)

ui-tui/packages/hermes-ink/src/ink/parse-keypress.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest'
+
+import { INITIAL_STATE, parseMultipleKeypresses } from './parse-keypress.js'
+import { PASTE_END, PASTE_START } from './termio/csi.js'
+
+describe('parseMultipleKeypresses bracketed paste recovery', () => {
+  it('emits empty bracketed pastes when the terminal sends both markers', () => {
+    const [keys, state] = parseMultipleKeypresses(INITIAL_STATE, PASTE_START + PASTE_END)
+
+    expect(keys).toHaveLength(1)
+    expect(keys[0]).toMatchObject({ isPasted: true, raw: '' })
+    expect(state.mode).toBe('NORMAL')
+  })
+
+  it('flushes unterminated paste content back to normal input mode', () => {
+    const [pendingKeys, pendingState] = parseMultipleKeypresses(INITIAL_STATE, PASTE_START + 'hello')
+
+    expect(pendingKeys).toEqual([])
+    expect(pendingState.mode).toBe('IN_PASTE')
+
+    const [keys, state] = parseMultipleKeypresses(pendingState, null)
+
+    expect(keys).toHaveLength(1)
+    expect(keys[0]).toMatchObject({ isPasted: true, raw: 'hello' })
+    expect(state.mode).toBe('NORMAL')
+    expect(state.pasteBuffer).toBe('')
+  })
+
+  it('resets an empty unterminated paste start instead of staying stuck', () => {
+    const [pendingKeys, pendingState] = parseMultipleKeypresses(INITIAL_STATE, PASTE_START)
+
+    expect(pendingKeys).toEqual([])
+    expect(pendingState.mode).toBe('IN_PASTE')
+
+    const [keys, state] = parseMultipleKeypresses(pendingState, null)
+
+    expect(keys).toEqual([])
+    expect(state.mode).toBe('NORMAL')
+    expect(state.pasteBuffer).toBe('')
+  })
+})

ui-tui/packages/hermes-ink/src/ink/parse-keypress.ts

@@ -288,9 +288,14 @@ export function parseMultipleKeypresses(
     }
   }
 
-  // If flushing and still in paste mode, emit what we have
-  if (isFlush && inPaste && pasteBuffer) {
-    keys.push(createPasteKey(pasteBuffer))
+  // If a terminal drops the paste-end marker, the App watchdog flushes the
+  // partial paste and returns to normal input instead of swallowing all future
+  // keystrokes as paste content.
+  if (isFlush && inPaste) {
+    if (pasteBuffer) {
+      keys.push(createPasteKey(pasteBuffer))
+    }
+
     inPaste = false
     pasteBuffer = ''
   }

ui-tui/src/components/thinking.tsx

@@ -1,5 +1,5 @@
 import { Box, NoSelect, Text } from '@hermes/ink'
-import { memo, type ReactNode, useEffect, useMemo, useState } from 'react'
+import { memo, useEffect, useMemo, useState, type ReactNode } from 'react'
 import spinners, { type BrailleSpinnerName } from 'unicode-animations'
 
 import { THINKING_COT_MAX } from '../config/limits.js'
@@ -873,7 +873,7 @@ export const ToolTrail = memo(function ToolTrail({
   const hasTools = groups.length > 0
   const hasSubagents = subagents.length > 0
   const hasMeta = meta.length > 0
-  const hasThinking = !!cot || reasoningActive || busy
+  const hasThinking = !!cot || reasoningActive || reasoningStreaming
   const thinkingLive = reasoningActive || reasoningStreaming
 
   const tokenCount =