feat(tts): add TTSControls component with play/pause/stop and rate

src/components/TTSControls.tsx

@@ -0,0 +1,77 @@
+import React from 'react'
+import { useTextToSpeech } from '../hooks/useTextToSpeech'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faPlay, faPause, faStop } from '@fortawesome/free-solid-svg-icons'
+
+interface Props {
+  text: string
+  defaultLang?: string
+  className?: string
+}
+
+const TTSControls: React.FC<Props> = ({ text, defaultLang, className }) => {
+  const {
+    supported, speaking, paused,
+    speak, pause, resume, stop,
+    rate, setRate
+  } = useTextToSpeech({ defaultLang })
+
+  const canPlay = supported && text?.trim().length > 0
+
+  const handlePlayPause = () => {
+    if (!canPlay) return
+    if (!speaking) {
+      speak(text, defaultLang)
+    } else if (paused) {
+      resume()
+    } else {
+      pause()
+    }
+  }
+
+  const playLabel = !speaking ? 'Listen' : (paused ? 'Resume' : 'Pause')
+
+  if (!supported) return null
+
+  return (
+    <div className={className || 'tts-controls'} style={{ display: 'flex', gap: '0.5rem', alignItems: 'center', flexWrap: 'wrap' }}>
+      <button
+        type="button"
+        className="article-menu-btn"
+        onClick={handlePlayPause}
+        title={playLabel}
+        disabled={!canPlay}
+      >
+        <FontAwesomeIcon icon={!speaking ? faPlay : (paused ? faPlay : faPause)} />
+        <span style={{ marginLeft: 6 }}>{playLabel}</span>
+      </button>
+      <button
+        type="button"
+        className="article-menu-btn"
+        onClick={stop}
+        title="Stop"
+        disabled={!speaking && !paused}
+      >
+        <FontAwesomeIcon icon={faStop} />
+        <span style={{ marginLeft: 6 }}>Stop</span>
+      </button>
+      <label style={{ display: 'inline-flex', alignItems: 'center', gap: 6, color: '#aaa', fontSize: 12 }}>
+        Speed
+        <select
+          value={rate}
+          onChange={e => setRate(Number(e.target.value))}
+          style={{ background: 'transparent', color: 'inherit', border: '1px solid #444', borderRadius: 4, padding: '2px 6px' }}
+        >
+          <option value={0.8}>0.8x</option>
+          <option value={1}>1x</option>
+          <option value={1.2}>1.2x</option>
+          <option value={1.4}>1.4x</option>
+          <option value={1.6}>1.6x</option>
+        </select>
+      </label>
+    </div>
+  )
+}
+
+export default TTSControls
+