- Fix preview bug: preview event handlers were never attached when
Summernote failed to load (fallback returned early at line 240)
- Restructure layout with Bootstrap tabs (Editor | Vorschau) instead
of stacked editor+hidden preview
- Preview loads automatically when switching to the Vorschau tab
- Editor content getter works in all modes (Summernote, code, fallback)
- Editor now uses full viewport height for more editing space
- Variables sidebar gets 3 cols (was 4) giving editor 9 cols (was 8)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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