v0.4.0

Added

• Enable adding MIDI and audio files from the MIDI editor with improved webview file handling.
• Add default highlight mode for clearer baseline view in the player.

Changed

• Switch build workflow to pnpm, update VS Code launch config, and clean build scripts.
• Adjust track row spacing and control alignment for better readability.

Fixed

• Ensure the webview waits for stable container dimensions before processing MIDI data.
• Disable drag-and-drop uploads in the VS Code view to prevent unintended imports.