feat(editor): Implement SDFs for drawing primitives and fix spectrogram clearing

Refactored drawing primitives in the spectrogram editor to use Signed Distance Functions (SDFs), providing smoother and more flexible shape generation.

- : Now stores shape parameters in SDF-friendly world coordinates (frame and log-scaled frequency) and includes a  parameter for each shape.

- : Completely rewritten to utilize SDFs (, , ) for applying shape effects to the spectrogram data, including attenuation with .

- Fixed an issue where the generated spectrogram was not being cleared to zero, ensuring a blank canvas for new drawings.

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