Update npm packages

[DonJayamanne]

No description provided.

[Copilot]

Pull request overview

This PR updates the Vega visualization library ecosystem from v5 to v6, along with related packages (vega-embed v6→v7, vega-lite v5→v6) and their transitive dependencies. The update also includes a Node.js version bump from v20.17.0 to v22.20.0 and adds TypeScript module resolution configuration.

Key Changes

• Major version updates for Vega packages (v5→v6, v6→v7 for vega-embed, v5→v6 for vega-lite)
• Node.js version update from v20.17.0 to v22.20.0
• Addition of "moduleResolution": "bundler" to TypeScript configuration

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
.nvmrc	Updates Node.js version to v22.20.0 (nonexistent version - critical issue)
package.json	Updates vega packages to v6.x/v7.x and adds vega-lite v6 MIME type (with formatting error)
package-lock.json	Reflects dependency updates with new versions, removal of node-fetch and other deprecated packages
src/client/tsconfig.json	Adds "bundler" module resolution strategy for TypeScript

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