feat(mobile): redesign today home and switch mentor persona to female

- today: immersive community hero + hold-to-talk voice card, numbered
  schedule rows, common-functions grid (learning/report/question-board)
- login: female mentor bust; sop: female mentor chat avatars
- speech: raise browser-fallback mentor pitch to match female voice

mobile-uni/src/services/speech.ts

@@ -151,7 +151,7 @@ export const createSpeechPlaybackController = (
     const utterance = new window.SpeechSynthesisUtterance(value.slice(0, 600));
     utterance.lang = 'zh-CN';
     utterance.rate = profile?.speed || 0.95;
-    utterance.pitch = profile?.role === 'mentor' ? 0.85 : profile?.role === 'customer' ? 1.05 : 1;
+    utterance.pitch = profile?.role === 'mentor' ? 1.06 : profile?.role === 'customer' ? 1.05 : 1;
     utterance.onend = () => {
       if (currentGeneration === generation && activeKey === key) stop();
     };