feat(classroom): integrate user feedback — audio speed, METAR TTS, phonetics, UI fixes

- Lower default audio speed to 0.85x, extend slider range to 0.5-1.3x
- Add METAR normalization for intelligible TTS (wind, vis, clouds, temp, QNH)
- Expand SID/STAR suffix regex to handle spaces (SUGOL 2S)
- Add approach suffix phonetic expansion (ILS 08R Y → Yankee)
- Fix "Soll:" → "Expected:" in readback feedback
- Accept numeric values for pushback delay field
- Add news article documenting the changes

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

shared/data/learnModules.ts

@@ -759,7 +759,8 @@ const readbackLessons = [
         expected: scenario => scenario.pushDelayWords,
         alternatives: scenario => [
           scenario.pushDelayWords,
-          `${scenario.pushDelayMinutes} minutes`
+          `${scenario.pushDelayMinutes} minutes`,
+          scenario.pushDelayMinutes.toString()
         ],
         width: 'md'
       },