fix: add typesVersions fallback for clsx/lite (fixes #92)

[3ni8ma]

Fixes #92.

Repro: TS project with moduleResolution node importing { clsx } from 'clsx/lite' fails with TS2307 before this change, passes after. bundler mode still passes.

Root cause: ./lite exposed only via exports map; classic node resolution ignores exports and looks for lite.d.ts at root.

Change: package.json adds typesVersions { *: { lite: [./clsx.d.ts] } }; readme notes bundler/nodenext/node16+ for full exports support.

Tests: npm run build + npm test green; tsc matrix node=pass, bundler=pass; CJS smoke clsx('hello', true && 'foo') => 'hello foo'. Trace snippet attached in comments.

[3ni8ma]

tsc --traceResolution (TS 5.5.4, moduleResolution: node) after fix — local paths shortened to <repro>:

======== Resolving module 'clsx/lite' from '<repro>/check.ts'. ========
Explicitly specified module resolution kind: 'Node10'.
Loading module 'clsx/lite' from 'node_modules' folder, target file types: TypeScript, Declaration.
Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
Found 'package.json' at '<repro>/node_modules/clsx/package.json'.
'package.json' has a 'typesVersions' field with version-specific path mappings.
'package.json' has a 'typesVersions' entry '*' that matches compiler version '5.5.4', looking for a pattern to match module name 'lite'.
Module name 'lite', matched pattern 'lite'.
Trying substitution './clsx.d.ts', candidate module location: './clsx.d.ts'.
File '<repro>/node_modules/clsx/clsx.d.ts' exists - use it as a name resolution result.
======== Module name 'clsx/lite' was successfully resolved to '<repro>/node_modules/clsx/clsx.d.ts'. ========

Before the fix, the same project failed with TS2307: Cannot find module 'clsx/lite'. (Earlier version of this comment pasted raw local paths — replaced with the sanitized trace above; proof unchanged.)