chore: Add Claude Code project configuration

.claude/CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project
+
+`@mll-lab/react-components` — shared React component library built on Ant Design 4, styled-components 6, and TypeScript 5.
+Published to npm with dual ESM/CJS output via Rollup.
+
+Repository: https://github.com/mll-lab/react-components
+
+## Commands
+
+Run `yarn` before other commands to install dependencies and ensure they are up to date.
+
+```bash
+yarn run test                              # Run all tests (Jest)
+yarn run test src/DatePicker/index.test.tsx  # Run a single test file
+yarn run test --testPathPattern=DatePicker  # Run tests matching a pattern
+yarn run lint                              # ESLint
+yarn run fix                               # ESLint with --fix
+yarn run typecheck                         # TypeScript check (no emit)
+yarn run build                             # Full build: clean + Rollup + TS declarations
+yarn run storybook                         # Dev server on port 6006
+yarn run validate                          # lint + typecheck + test + test:storybook
+```
+
+## Architecture
+
+### Component Pattern
+
+Each component lives in `src/<ComponentName>/` with an `index.tsx` entry.
+Many components are thin wrappers around Ant Design, re-exporting with consistent types:
+
+```tsx
+export const Alert: typeof AntdAlert = AntdAlert;
+export type AlertProps = AntdAlertProps;
+```
+
+All public exports go through `src/index.ts` — named exports only, no default exports.
+
+### Styling
+
+- **`src/theme.ts`** defines `PALETTE` (raw colors) and `THEME` (semantic mapping like `successColor`, `errorColor`)
+- `<Provider>` wraps apps with ThemeProvider; components access theme via `useTheme()`
+- Ant Design Less overrides in `src/antd.less`
+
+### Storybook
+
+`yarn run storybook` starts the dev server on port 6006.
+`yarn run test:storybook` runs visual tests via Playwright against the running Storybook dev server.
+Playwright browsers must be installed first via `yarn playwright install`.
+
+### Testing
+
+- Test ID attribute is `id` (not `data-testid`)
+
+## Releases and Pre-releases
+
+Releases are fully automated via semantic-release.
+The release workflow is triggered by pushes to `master`, `alpha`, and `beta` branches.
+
+- **`master`** — stable releases (e.g. `20.4.0`)
+- **`alpha`** — alpha pre-releases (e.g. `19.16.0-alpha.1`), published on the `alpha` npm dist-tag
+- **`beta`** — beta pre-releases, published on the `beta` npm dist-tag
+
+### Pre-release workflow
+
+To test breaking or experimental changes before a stable release:
+
+1. Create/update the `alpha` branch (branch off `master` or merge into existing `alpha`)
+2. Push commits with conventional commit messages to `alpha`
+3. semantic-release automatically publishes a version like `X.Y.Z-alpha.N` to npm
+4. Consumers install with `yarn add @mll-lab/react-components@alpha`
+5. When ready, merge `alpha` into `master` for a stable release
+
+The `alpha` and `beta` branches are **long-lived** — do not delete them after merging.
+Conventional commits determine the version bump (feat = minor, fix = patch, BREAKING CHANGE = major) on all branches equally.
+
+## Conventions
+
+- Component types follow the pattern `ComponentNameProps` and `ComponentNameRef`

.claude/settings.json

@@ -0,0 +1,24 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(yarn install:*)",
+      "Bash(yarn run build:*)",
+      "Bash(yarn run build:clean:*)",
+      "Bash(yarn run build:es:*)",
+      "Bash(yarn run build:ts:*)",
+      "Bash(yarn run validate:*)",
+      "Bash(yarn run test:*)",
+      "Bash(yarn run test:watch:*)",
+      "Bash(yarn run test:storybook:*)",
+      "Bash(yarn run lint:*)",
+      "Bash(yarn run fix:*)",
+      "Bash(yarn run typecheck:*)",
+      "Bash(yarn run storybook:*)",
+      "Bash(yarn run storybook:build:*)",
+      "Bash(yarn playwright install:*)"
+    ],
+    "deny": [
+      "Bash(yarn run release:*)"
+    ]
+  }
+}