fix(tui): fix Linux Ctrl+C regression, remove double clipboard write

- Fix critical regression: on Linux, Ctrl+C could not interrupt/clear/exit
  because isAction(key,'c') shadowed the isCtrl block (both resolve to k.ctrl
  on non-macOS). Restructured: isAction block now falls through to interrupt
  logic on non-macOS when no selection exists.
- Remove double pbcopy: ink's copySelection() already calls setClipboard()
  which handles pbcopy+tmux+OSC52. The extra writeClipboardText call in
  useInputHandlers copySelection() was firing pbcopy a second time.
- Remove allowClipboardHotkeys prop from TextInput — every caller passed
  isMac, and TextInput already imports isMac. Eliminated prop-drilling
  through appLayout, maskedPrompt, and prompts.
- Remove dead code: the isCtrl copy paths (lines 277-288) were unreachable
  on any platform after the isAction block changes.
- Simplify textInput Cmd+C: use writeClipboardText directly without the
  redundant OSC52 fallback (this path is macOS-only where pbcopy works).

ui-tui/src/app/useInputHandlers.ts

@@ -8,8 +8,6 @@ import type {
   VoiceRecordResponse
 } from '../gatewayTypes.js'
 
-import { writeClipboardText } from '../lib/clipboard.js'
-import { writeOsc52Clipboard } from '../lib/osc52.js'
 import { isAction, isMac } from '../lib/platform.js'
 
 import { getInputSelection } from './inputSelectionStore.js'
@@ -30,19 +28,13 @@ export function useInputHandlers(ctx: InputHandlerContext): InputHandlerResult {
   const pagerPageSize = Math.max(5, (terminal.stdout?.rows ?? 24) - 6)
 
   const copySelection = () => {
+    // ink's copySelection() already calls setClipboard() which handles
+    // pbcopy (macOS), wl-copy/xclip (Linux), tmux, and OSC 52 fallback.
     const text = terminal.selection.copySelection()
 
-    if (!text) {
-      return
+    if (text) {
+      actions.sys(`copied ${text.length} chars`)
     }
-
-    void writeClipboardText(text).then(copied => {
-      if (!copied) {
-        writeOsc52Clipboard(text)
-      }
-    })
-
-    actions.sys(`copied ${text.length} chars`)
   }
 
   const clearSelection = () => {
@@ -259,34 +251,19 @@ export function useInputHandlers(ctx: InputHandlerContext): InputHandlerResult {
       const inputSel = getInputSelection()
 
       if (inputSel && inputSel.end > inputSel.start) {
-        const text = inputSel.value.slice(inputSel.start, inputSel.end)
-
-        void writeClipboardText(text).then(copied => {
-          if (!copied) {
-            writeOsc52Clipboard(text)
-          }
-        })
-
-        inputSel.clear()
-      }
-
-      return
-    }
-
-    if (isCtrl(key, ch, 'c')) {
-      if (!isMac && terminal.hasSelection) {
-        return copySelection()
-      }
-
-      const inputSel = getInputSelection()
-
-      if (!isMac && inputSel && inputSel.end > inputSel.start) {
-        writeOsc52Clipboard(inputSel.value.slice(inputSel.start, inputSel.end))
         inputSel.clear()
 
         return
       }
 
+      // On macOS, Cmd+C with no selection is a no-op (Ctrl+C below handles interrupt).
+      // On non-macOS, isAction uses Ctrl, so fall through to interrupt/clear/exit.
+      if (isMac) {
+        return
+      }
+    }
+
+    if (key.ctrl && ch.toLowerCase() === 'c') {
       if (live.busy && live.sid) {
         return turnController.interruptTurn({
           appendMessage: actions.appendMessage,

ui-tui/src/components/appLayout.tsx

@@ -6,7 +6,6 @@ import type { AppLayoutProgressProps, AppLayoutProps } from '../app/interfaces.j
 import { $isBlocked } from '../app/overlayStore.js'
 import { $uiState } from '../app/uiStore.js'
 import { PLACEHOLDER } from '../content/placeholders.js'
-import { isMac } from '../lib/platform.js'
 import type { Theme } from '../theme.js'
 import type { DetailsMode } from '../types.js'
 
@@ -236,7 +235,6 @@ const ComposerPane = memo(function ComposerPane({
             <Box flexGrow={1} position="relative">
               <TextInput
                 columns={Math.max(20, composer.cols - pw)}
-                allowClipboardHotkeys={isMac}
                 onChange={composer.updateInput}
                 onPaste={composer.handleTextPaste}
                 onSubmit={composer.submit}

ui-tui/src/components/maskedPrompt.tsx

@@ -2,7 +2,6 @@ import { Box, Text } from '@hermes/ink'
 import { useState } from 'react'
 
 import type { Theme } from '../theme.js'
-import { isMac } from '../lib/platform.js'
 
 import { TextInput } from './textInput.js'
 
@@ -19,7 +18,7 @@ export function MaskedPrompt({ cols = 80, icon, label, onSubmit, sub, t }: Maske
 
       <Box>
         <Text color={t.color.label}>{'> '}</Text>
-        <TextInput columns={Math.max(20, cols - 6)} allowClipboardHotkeys={isMac} mask="*" onChange={setValue} onSubmit={onSubmit} value={value} />
+        <TextInput columns={Math.max(20, cols - 6)} mask="*" onChange={setValue} onSubmit={onSubmit} value={value} />
       </Box>
     </Box>
   )

ui-tui/src/components/prompts.tsx

@@ -126,7 +126,7 @@ export function ClarifyPrompt({ cols = 80, onAnswer, onCancel, req, t }: Clarify
 
         <Box>
           <Text color={t.color.label}>{'> '}</Text>
-          <TextInput columns={Math.max(20, cols - 6)} allowClipboardHotkeys={isMac} onChange={setCustom} onSubmit={onAnswer} value={custom} />
+          <TextInput columns={Math.max(20, cols - 6)} onChange={setCustom} onSubmit={onAnswer} value={custom} />
         </Box>
 
         <Text color={t.color.dim}>

ui-tui/src/components/textInput.tsx

@@ -5,7 +5,6 @@ import { useEffect, useMemo, useRef, useState } from 'react'
 import { setInputSelection } from '../app/inputSelectionStore.js'
 import { readClipboardText, writeClipboardText } from '../lib/clipboard.js'
 import { isActionMod, isMac } from '../lib/platform.js'
-import { writeOsc52Clipboard } from '../lib/osc52.js'
 
 type InkExt = typeof Ink & {
   stringWidth: (s: string) => number
@@ -282,7 +281,6 @@ export function TextInput({
   onChange,
   onPaste,
   onSubmit,
-  allowClipboardHotkeys = false,
   mask,
   placeholder = '',
   focus = true
@@ -508,12 +506,12 @@ export function TextInput({
     (inp: string, k: Key, event: InputEvent) => {
       const eventRaw = event.keypress.raw
 
-      if (eventRaw === '\x1bv' || eventRaw === '\x1bV' || eventRaw === '\x16' || (allowClipboardHotkeys && isMac && k.meta && inp.toLowerCase() === 'v')) {
+      if (eventRaw === '\x1bv' || eventRaw === '\x1bV' || eventRaw === '\x16' || (isMac && k.meta && inp.toLowerCase() === 'v')) {
         if (cbPaste.current) {
           return void emitPaste({ cursor: curRef.current, hotkey: true, text: '', value: vRef.current })
         }
 
-        if (allowClipboardHotkeys) {
+        if (isMac) {
           void readClipboardText().then(text => {
             if (text) {
               pastePlainText(text)
@@ -524,17 +522,13 @@ export function TextInput({
         return
       }
 
-      if (allowClipboardHotkeys && isMac && k.meta && inp.toLowerCase() === 'c') {
+      if (isMac && k.meta && inp.toLowerCase() === 'c') {
         const range = selRange()
 
         if (range) {
           const text = vRef.current.slice(range.start, range.end)
 
-          void writeClipboardText(text).then(copied => {
-            if (!copied) {
-              writeOsc52Clipboard(text)
-            }
-          })
+          void writeClipboardText(text)
         }
 
         return
@@ -735,7 +729,6 @@ export interface PasteEvent {
 }
 
 interface TextInputProps {
-  allowClipboardHotkeys?: boolean
   columns?: number
   focus?: boolean
   mask?: string