fix: bump typescript to version 6

[GordonSmith]

Checklist:

• The commit message is properly formatted and free of typos.
  • The commit message title makes sense in a changelog, by itself.
  • The commit message includes a "fixes" reference if appropriate.
  • The commit is signed.
• The change has been fully tested:
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• There are no similar instances of the same problem that should be addressed
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  • I have raised new issues to address them separately

Testing:

[Copilot]

Pull request overview

This PR updates the repo’s TypeScript toolchain and TypeScript project configuration to align packages/tests with a new shared baseline and to support TS-driven builds with CSS imports.

Changes:

• Bump TypeScript to 6.0.2 (root + type-leaks test) and adjust dependency overrides.
• Introduce shared tests/tsconfig.settings.json and re-point test tsconfigs to it.
• Consolidate package tsconfigs onto packages/tsconfig.settings.json, add packages/global.d.ts for *.css, and normalize some CSS import paths.

Reviewed changes

Copilot reviewed 42 out of 44 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/type-leaks/package.json	Bump TS devDependency to 6.x
tests/tsconfig.settings.json	Add shared TS settings for tests
tests/node-esm/tsconfig.json	Extend new tests tsconfig settings
tests/node-cjs/tsconfig.json	Extend new tests tsconfig settings
tests/browser-umd/tsconfig.json	Extend new tests tsconfig settings
tests/browser-esm/tsconfig.json	Extend new tests tsconfig settings
packages/tsconfig.settings.json	Redefine shared package TS baseline
packages/global.d.ts	Add typings for importing .css
packages/api/tsconfig.json	Extend shared package tsconfig
packages/chart/tsconfig.json	Extend shared package tsconfig
packages/codemirror/tsconfig.json	Extend shared package tsconfig
packages/common/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/comms/tsconfig.json	Extend shared package tsconfig
packages/composite/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/dataflow/tsconfig.json	Extend shared package tsconfig
packages/ddl-shim/tsconfig.json	Extend shared package tsconfig
packages/dgrid/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/dgrid2/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/dgrid/tests/dgrid.browser.spec.ts	Remove extra blank lines in test
packages/dgrid-shim/tsconfig.json	Adjust TS config (now standalone)
packages/dgrid-shim/package.json	Add TS devDependency for shim package
packages/eclwatch/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/esbuild-plugins/tsconfig.json	Extend shared package tsconfig
packages/form/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/graph/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/graph/src/Edge.ts	Normalize CSS import path
packages/graph/src/Graph.ts	Normalize CSS import path
packages/graph/src/Sankey.ts	Normalize CSS import path
packages/graph/src/Subgraph.ts	Normalize CSS import path
packages/graph/src/Vertex.ts	Normalize CSS import path
packages/html/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/layout/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/map/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/map/src/Layered.ts	Normalize Utility import extension
packages/markdown-it-plugins/tsconfig.json	Extend shared package tsconfig
packages/observablehq-compiler/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/other/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/phosphor/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/react/tsconfig.json	Extend shared package tsconfig
packages/timeline/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/tree/tsconfig.json	Extend shared tsconfig + include global.d.ts
packages/util/tsconfig.json	Extend shared package tsconfig
package.json	Bump TS + adjust ESLint parser and overrides
package-lock.json	Lockfile updates for new TS/tooling

[GordonSmith]

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