matchPreset was replacing systemInstruction with the preset's
template on keyword match. Typing 'epic orchestra' would
auto-apply 'Epic Orchestra Intro (8 Bars)' restrictive template.
Removed both override blocks (Piano Roll MIDI gen + DAW
rearrange). System instruction stays as generic default.
User can still fill prompt via suggestion click without
forced template override.
3dtours
4c3d649506