Update typescript to latest version

[zorkow]

PR updates typescript to the latest version 7.0.2.

• Adapts the configuration files to work with changes already introduced in TS6.
• Intermediate solution for eslint and typedoc

Changes to Configuration Files

All changes are in tsconfig/ and mainly missing rootDir. Changes to other compiler options thanks to DuckAI. Summary table thanks to Claude.

File	Change
common.json	Dropped removed baseUrl / downlevelIteration. Added "strict": false — TS7 defaults strict to true, which leads to 1672 type errors.
mjs.json	Added explicit "rootDir": "../ts" (TS7 requires it rather than inferring it).
cjs.json	Added explicit "rootDir": "../ts". target changed ES5 → ES2015 (ES5 emit target was removed in TS7).
worker.json	Added "rootDir": "../ts/a11y/sre".
worker-cjs.json	Added "rootDir": "../ts/a11y/sre". moduleResolution changed node (→ legacy node10, removed) → bundler.
components.json	Added "rootDir": "../components/mjs".

Work around for linting and typedoc

Since TS7 does not yet expose an API yet, we use the dual approach suggested in
https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/#running-side-by-side-with-typescript-6.0
which allows both typescript-eslint and typedoc to run using TSv6.0.2.

Issues to follow for updates

(Links quoted to not make noise on the trackers.)

For typedoc
https://github.com/TypeStrong/typedoc/issues/3098

For typescript-eslint
https://github.com/typescript-eslint/typescript-eslint/issues/10940

[dpvc]

I tried it and it seems to work well. Compiling seems faster, though I haven't done any formal testing. Thanks for working this out.