fix(tui): readline parity on Linux — Ctrl+A = home, Alt+B/F word nav

textInput treated the platform action-mod (Cmd on macOS, Ctrl on Linux)
as the sole word-boundary modifier. On Linux that meant:

- Ctrl+A selected all instead of jumping to line start (contra standard
  readline and the hotkey doc in README.md which says `Ctrl+A` = Start
  of line).
- Alt+B / Alt+F / Alt+Backspace / Alt+Delete were dropped, because
  `key.meta` was never consulted — the README already documented
  `Meta+B` / `Meta+F` as word nav.

Gate select-all to macOS Cmd+A (`isMac && mod && inp === 'a'`), route
Linux Ctrl+A through `actionHome`, and broaden every word-boundary
predicate (b/f/Backspace/Delete and the modified arrow keys) from `mod`
to `wordMod = mod || k.meta` so Alt chords work on Linux and Mac while
existing Ctrl/Cmd chords keep working.

ui-tui/src/components/appChrome.tsx

@@ -28,8 +28,7 @@ function FaceTicker({ color, startedAt }: { color: string; startedAt?: null | nu
 
   return (
     <Text color={color}>
-      {FACES[tick % FACES.length]} {VERBS[tick % VERBS.length]}…
-      {startedAt ? ` · ${fmtDuration(now - startedAt)}` : ''}
+      {FACES[tick % FACES.length]} {VERBS[tick % VERBS.length]}…{startedAt ? ` · ${fmtDuration(now - startedAt)}` : ''}
     </Text>
   )
 }
@@ -127,7 +126,11 @@ export function StatusRule({
       <Box flexShrink={1} width={leftWidth}>
         <Text color={t.color.bronze} wrap="truncate-end">
           {'─ '}
-          {busy ? <FaceTicker color={statusColor} startedAt={turnStartedAt} /> : <Text color={statusColor}>{status}</Text>}
+          {busy ? (
+            <FaceTicker color={statusColor} startedAt={turnStartedAt} />
+          ) : (
+            <Text color={statusColor}>{status}</Text>
+          )}
           <Text color={t.color.dim}> │ {model}</Text>
           {ctxLabel ? <Text color={t.color.dim}> │ {ctxLabel}</Text> : null}
           {bar ? (

ui-tui/src/components/prompts.tsx

@@ -1,11 +1,11 @@
 import { Box, Text, useInput } from '@hermes/ink'
 import { useState } from 'react'
 
+import { isMac } from '../lib/platform.js'
 import type { Theme } from '../theme.js'
 import type { ApprovalReq, ClarifyReq, ConfirmReq } from '../types.js'
 
 import { TextInput } from './textInput.js'
-import { isMac } from '../lib/platform.js'
 
 const OPTS = ['once', 'session', 'always', 'deny'] as const
 const LABELS = { always: 'Always allow', deny: 'Deny', once: 'Allow once', session: 'Allow this session' } as const
@@ -130,7 +130,8 @@ export function ClarifyPrompt({ cols = 80, onAnswer, onCancel, req, t }: Clarify
         </Box>
 
         <Text color={t.color.dim}>
-          Enter send · Esc {choices.length ? 'back' : 'cancel'} · {isMac ? 'Cmd+C copy · Cmd+V paste · Ctrl+C cancel' : 'Ctrl+C cancel'}
+          Enter send · Esc {choices.length ? 'back' : 'cancel'} ·{' '}
+          {isMac ? 'Cmd+C copy · Cmd+V paste · Ctrl+C cancel' : 'Ctrl+C cancel'}
         </Text>
       </Box>
     )

ui-tui/src/components/textInput.tsx

@@ -277,8 +277,9 @@ function useFwdDelete(active: boolean) {
 
 type PasteResult = { cursor: number; value: string } | null
 
-const isPasteResultPromise = (value: PasteResult | Promise<PasteResult> | null | undefined): value is Promise<PasteResult> =>
-  !!value && typeof (value as PromiseLike<PasteResult>).then === 'function'
+const isPasteResultPromise = (
+  value: PasteResult | Promise<PasteResult> | null | undefined
+): value is Promise<PasteResult> => !!value && typeof (value as PromiseLike<PasteResult>).then === 'function'
 
 export function TextInput({
   columns = 80,
@@ -522,9 +523,11 @@ export function TextInput({
     }
 
     const range = selRange()
+
     const nextValue = range
       ? vRef.current.slice(0, range.start) + cleaned + vRef.current.slice(range.end)
       : vRef.current.slice(0, curRef.current) + cleaned + vRef.current.slice(curRef.current)
+
     const nextCursor = range ? range.start + cleaned.length : curRef.current + cleaned.length
 
     commit(nextValue, nextCursor)
@@ -591,7 +594,8 @@ export function TextInput({
       let c = curRef.current
       let v = vRef.current
       const mod = isActionMod(k)
-      const actionHome = k.home || isMacActionFallback(k, inp, 'a')
+      const wordMod = mod || k.meta
+      const actionHome = k.home || (!isMac && mod && inp === 'a') || isMacActionFallback(k, inp, 'a')
       const actionEnd = k.end || (mod && inp === 'e') || isMacActionFallback(k, inp, 'e')
       const actionDeleteToStart = (mod && inp === 'u') || isMacActionFallback(k, inp, 'u')
       const range = selRange()
@@ -605,7 +609,7 @@ export function TextInput({
         return swap(redo, undo)
       }
 
-      if (mod && inp === 'a') {
+      if (isMac && mod && inp === 'a') {
         return selectAll()
       }
 
@@ -616,32 +620,32 @@ export function TextInput({
         clearSel()
         c = v.length
       } else if (k.leftArrow) {
-        if (range && !mod) {
+        if (range && !wordMod) {
           clearSel()
           c = range.start
         } else {
           clearSel()
-          c = mod ? wordLeft(v, c) : prevPos(v, c)
+          c = wordMod ? wordLeft(v, c) : prevPos(v, c)
         }
       } else if (k.rightArrow) {
-        if (range && !mod) {
+        if (range && !wordMod) {
           clearSel()
           c = range.end
         } else {
           clearSel()
-          c = mod ? wordRight(v, c) : nextPos(v, c)
+          c = wordMod ? wordRight(v, c) : nextPos(v, c)
         }
-      } else if (mod && inp === 'b') {
+      } else if (wordMod && inp === 'b') {
         clearSel()
         c = wordLeft(v, c)
-      } else if (mod && inp === 'f') {
+      } else if (wordMod && inp === 'f') {
         clearSel()
         c = wordRight(v, c)
       } else if (range && (k.backspace || delFwd)) {
         v = v.slice(0, range.start) + v.slice(range.end)
         c = range.start
       } else if (k.backspace && c > 0) {
-        if (mod) {
+        if (wordMod) {
           const t = wordLeft(v, c)
           v = v.slice(0, t) + v.slice(c)
           c = t
@@ -651,7 +655,7 @@ export function TextInput({
           c = t
         }
       } else if (delFwd && c < v.length) {
-        if (mod) {
+        if (wordMod) {
           const t = wordRight(v, c)
           v = v.slice(0, c) + v.slice(t)
         } else {
@@ -778,7 +782,9 @@ interface TextInputProps {
   focus?: boolean
   mask?: string
   onChange: (v: string) => void
-  onPaste?: (e: PasteEvent) => { cursor: number; value: string } | Promise<{ cursor: number; value: string } | null> | null
+  onPaste?: (
+    e: PasteEvent
+  ) => { cursor: number; value: string } | Promise<{ cursor: number; value: string } | null> | null
   onSubmit?: (v: string) => void
   placeholder?: string
   value: string