fix: move package exports from publishConfig to top-level fields

[kimyouknow]

Summary

• react-simplikit@0.0.47 and @react-simplikit/mobile@0.0.1 were published with broken entry points (main: "./src/index.ts" instead of built output)
• Root cause: changeset publish internally uses npm publish, which does NOT support publishConfig field overrides for manifest fields like main, types, module, exports
• Previous version (0.0.46) worked because it was published via yarn npm publish (which does support this), before the changesets migration

Changes

packages/core/package.json

• Move main, types, module, exports from publishConfig to top-level
• Keep only publishConfig.access: "public"

packages/mobile/package.json

• Same treatment as core

.changeset/fix-publishconfig.md

• Patch changeset for both packages to trigger new releases (0.0.48 / 0.0.2)

Verification

$ npm pack (core)
main: ./dist/index.cjs      ✓ (was: ./src/index.ts)
types: ./dist/index.d.cts   ✓ (was: undefined)
module: ./esm/index.js      ✓ (was: undefined)
exports: { ... }            ✓ (was: undefined)

$ npm pack (mobile)
main: ./dist/index.cjs      ✓
types: ./dist/index.d.ts    ✓
module: ./dist/index.js     ✓
exports: { ... }            ✓

Expected release flow

This PR merge
  → changesets/action detects changeset → creates Version PR
     - react-simplikit: 0.0.47 → 0.0.48
     - @react-simplikit/mobile: 0.0.1 → 0.0.2

Version PR merge
  → changeset publish → npm publish
  → Correct main/types/exports in published package.json ✓

Test plan

• npm pack for both packages shows correct top-level fields
• yarn build succeeds for both packages
• yarn changeset status shows both packages pending patch
• After merge: Version PR auto-created
• After Version PR merge: published packages have correct entry points

[github-actions]

Size Change: 0 B 🆕

Total Size: 0 B

_{compressed-size-action}

[kimyouknow]

Snapshot Verification Results

Published canary versions and verified in a real consumer project:

1. npm registry fields — ✅ Correct

react-simplikit@0.0.0-canary-20260210142111
  main: ./dist/index.cjs
  types: ./dist/index.d.cts
  module: ./esm/index.js
  exports: ✓ (ESM + CJS with types)

@react-simplikit/mobile@0.0.0-canary-20260210142111
  main: ./dist/index.cjs
  types: ./dist/index.d.ts
  module: ./dist/index.js
  exports: ✓ (ESM + CJS with types)

2. Consumer project verification — ✅ Pass

Tested in some project (uses usePreservedCallback, useAsyncEffect, useBooleanState):

• TypeScript typecheck (tsc --noEmit): ✅ Pass (0 errors)
• Next.js production build (next build): ✅ Pass

3. Broken versions deprecated — ✅ Done

npm deprecate react-simplikit@0.0.47 "Broken: main/types/exports point to source. Use 0.0.46 or 0.0.48+"
npm deprecate @react-simplikit/mobile@0.0.1 "Broken: main/types/exports point to source. Upgrade to 0.0.2+"

Comparison: before vs after

Field	0.0.47 (broken)	canary (fixed)
main	./src/index.ts ❌	./dist/index.cjs ✅
types	undefined ❌	./dist/index.d.cts ✅
module	undefined ❌	./esm/index.js ✅
exports	undefined ❌	ESM+CJS ✅