Bug Fixes & Dashboard Helper

🐛 Critical Fixes

• Fixed Broken Icons - All header buttons now show icons correctly
• Fixed Vacations Tab - Tab switching works properly now
• Improved Typography - Professional Inter font family

✨ New Feature

Dashboard Card Helper

Click the dashboard icon (📊) in the header to:

• Get ready-to-use YAML code
• Copy with one click
• Follow step-by-step instructions
• See feature preview

Example YAML:
```yaml
type: custom:timetable-card
entity: sensor.timetable_current
title: TimeTable
view: today
show_weekends: false
show_room: true
show_teacher: true
show_colors: true
```

🎨 What's Better

Before v4.0.1:

• ❌ Icons broken/missing
• ❌ Vacations tab didn't work
• ❌ Basic typography
• ❌ Manual YAML writing

After v4.0.1:

• ✅ All icons working beautifully
• ✅ All tabs functional
• ✅ Professional appearance
• ✅ One-click dashboard setup

📋 Upgrade Notes

Fully backward compatible - No breaking changes

Via HACS:

1. Update TimeTable integration
2. Restart Home Assistant
3. Hard refresh browser (Ctrl+F5)

🎯 Impact

This release resolves all critical issues from v4.0.0. Recommended upgrade for all users.

See RELEASE_NOTES_v4.0.1.md for complete details.