Fix clicks/drag, add mobile STT + ELL intro (v1.0.9)

- Fix: Practice Speaking chip closes drawer — use composedPath() in root
  click handler so chips removed from DOM during propagation still resolve
  correctly; also exclude toggle from triggering closeDrawer()
- Fix: Avatar widget snaps back after drag — only reset inline position
  styles when no saved drag position exists in localStorage
- Fix: Mobile Practice Speaking — MediaRecorder + Whisper fallback when
  SpeechRecognition unavailable (iOS Chrome/WKWebView); new transcribe.php
  proxies to OpenAI Whisper
- Fix: ELL Pronunciation on mobile — pre-request getUserMedia inside the
  user-gesture click handler and pass stream to realtime.js (iOS requires
  getUserMedia before async callbacks)
- New: ELL spoken greeting — SOLA says "I can help you with your
  pronunciation. Speak a word or sentence and I'll help!" at session start
  via response.create after session.updated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: caswelltom