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This commit significantly enhances the web spectrogram editor by implementing core drawing tools (line, ellipse, noise) and a robust undo/redo system.
- and : Added redo button and styling.
- : Implemented canvas event handling, dynamic shape previews, and the logic for lines and noise rectangles.
- : Now reconstructs the spectrogram from a clean base, allowing proper undo/redo.
- : Uses an improved color gradient for better visualization.
- : Stores original spectrogram data for persistent state management.
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