Refactors to support Spacewalk

[turner]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates the build toolchain from Rollup to Vite and the test framework from Mocha/Chai to Vitest. The changes include:

• Migration from Rollup to Vite for bundling
• Test framework migration from Mocha/Chai to Vitest
• Removal of Babel configuration
• Addition of extensive Spacewalk integration code for live maps
• Refactoring of dataset architecture to support both static Hi-C files and dynamic live maps
• CSS build improvements with SCSS module system

Reviewed Changes

Copilot reviewed 33 out of 45 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
package.json	Updated build tool dependencies from Rollup to Vite, test framework from Mocha to Vitest
vite.config.js	New Vite configuration for building library bundles
vitest.config.js	New Vitest configuration for running tests
vite-plugin-version.js	Custom Vite plugin to update version from package.json
js/hicDataset.js	Refactored to abstract base class with HiCDataset subclass
js/liveMapDataset.js	New dataset implementation for live/computed contact maps
js/hicBrowser.js	Updated to support multiple dataset types with activeDataset/activeState
test/*.js	Migrated tests from Mocha/Chai to Vitest
css/juicebox.scss	Updated to use SCSS module system with @use

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[Copilot]

@turner I've opened a new pull request, #401, to work on those changes. Once the pull request is ready, I'll request review from you.