DAW Improvements: UI sizing, autotune, playhead, export, instruments

[frogr]

Summary

Follow-up improvements to the MIDI DAW based on initial testing.

Tasks

1. UI Sizing Improvements

• Increase overall component sizes
• Reduce whitespace, make DAW take up more of the page
• Increase text sizes slightly for better readability

2. Add Autotune for Microphone Recording

• Add pitch detection using pitchy library
• Implement pitch correction/quantization to nearest semitone
• Add autotune toggle in recording panel

3. Fix Playhead (Red Progress Line)

• Make playhead extend full height of piano roll
• Ensure it's visible across all rows

4. Fix Export WAV Button

• Debug why export isn't working
• Ensure offline rendering completes properly
• Test download functionality

5. Add More Instruments

• Add bass synth preset
• Add pad/strings preset
• Add pluck/bell preset
• Add more drum sounds
• Consider adding FM synth option

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