Set sideEffects to CSS only + remove custom unused assets plugin

[MattIPv4]

cc alveusgg/data#221

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	extension-preview	4cd6325	Commit Preview URL Branch Preview URL	Dec 12 2025, 06:06 PM

[Copilot]

Pull request overview

This PR attempts to replace a custom UnusedAssetsPlugin webpack plugin with the sideEffects: false package.json configuration. However, this approach has a fundamental misunderstanding of what these two mechanisms do. The custom plugin removed unused asset files (images, fonts, etc.) from the build output, while sideEffects: false is a flag for JavaScript tree-shaking that tells bundlers which modules can be safely removed if their exports aren't used. These serve completely different purposes and are not interchangeable.

Key changes:

• Comments out the entire UnusedAssetsPlugin class implementation (52 lines)
• Comments out the plugin instantiation in the webpack plugins array
• Adds sideEffects: false to package.json

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
webpack.config.ts	Comments out the custom UnusedAssetsPlugin class and its usage in the plugins array
package.json	Adds sideEffects: false configuration, which is incompatible with the codebase's CSS imports and initialization code

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