chore(deps): refresh better-dx, drop the baseUrl TypeScript 7 removed

better-dx 0.2.15 to 0.2.22 brings TypeScript 7, which removed `baseUrl`
outright — so the typecheck stopped on the config before it read a line
of source.

Dropping it is the whole fix. The two `paths` entries are already
written relative to this file, which is how they resolve when there is
no `baseUrl` to resolve them against, so nothing else moves. Typecheck
clean, 205 tests passing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: chrisbbreuer