design-system/CLAUDE.md

# Cameleer3 Design System

## Before Building UI

Always read `COMPONENT_GUIDE.md` before building any UI feature. It contains decision trees for choosing the right component, composition patterns, and the full component index.

## Project Structure

- `src/design-system/primitives/` — atomic UI components (Button, Input, Badge, etc.)
- `src/design-system/composites/` — composed components (DataTable, Modal, Toast, etc.)
- `src/design-system/layout/` — page-level layout (AppShell, Sidebar, TopBar)
- `src/design-system/providers/` — ThemeProvider
- `src/design-system/tokens.css` — all design tokens (colors, spacing, typography)
- `src/pages/` — application pages
- `src/pages/Inventory/` — component showcase at `/inventory`

## Conventions

### Styling
- CSS Modules only — import as `import styles from './Component.module.css'`
- Use tokens from `tokens.css` — never hardcode hex colors
- All colors via CSS custom properties — supports light/dark via `[data-theme="dark"]`
- No inline styles except dynamic values (width from props, etc.)

### Components
- `forwardRef` on all form controls (Input, Textarea, Select, Checkbox, Toggle, Label, FilterPill)
- Every component accepts a `className` prop
- Semantic color variants: `'success' | 'warning' | 'error'` pattern
- Barrel exports: `src/design-system/primitives/index.ts` and `src/design-system/composites/index.ts`

### Testing
- Vitest + React Testing Library + happy-dom
- Tests co-located: `Component.test.tsx` next to `Component.tsx`
- Run: `npx vitest run` (all) or `npx vitest run src/path/to/Component` (single)
- Wrap in `<ThemeProvider>` when component uses `useTheme()` or `hashColor()`

### Import Paths
```tsx
import { Button, Input } from '../design-system/primitives'
import { Modal, DataTable, KpiStrip, SplitPane, EntityList, LogViewer } from '../design-system/composites'
import type { Column, KpiItem, LogEntry } from '../design-system/composites'
import { AppShell } from '../design-system/layout/AppShell'
import { Sidebar } from '../design-system/layout/Sidebar/Sidebar'
import { SidebarTree } from '../design-system/layout/Sidebar/SidebarTree'
import type { SidebarTreeNode } from '../design-system/layout/Sidebar/SidebarTree'
import { useStarred } from '../design-system/layout/Sidebar/useStarred'
import { ThemeProvider } from '../design-system/providers/ThemeProvider'
```

## Using This Design System in Other Apps

This design system is published as `@cameleer/design-system` to the Gitea npm registry.

### Registry: `https://gitea.siegeln.net/api/packages/cameleer/npm/`

### Setup in a consuming app

1. Add `.npmrc` to the project root:

```
@cameleer:registry=https://gitea.siegeln.net/api/packages/cameleer/npm/
//gitea.siegeln.net/api/packages/cameleer/npm/:_authToken=${GITEA_TOKEN}
```

Note: CI pipelines for consuming apps also need this `.npmrc` and a `GITEA_TOKEN` secret to fetch the package during `npm ci`.

2. Install:

```bash
# Snapshot builds (during development)
npm install @cameleer/design-system@dev

# Stable releases
npm install @cameleer/design-system
```

3. Add fonts to `index.html` (required — the package does not bundle fonts):

```html
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
```

Without these, `var(--font-body)` and `var(--font-mono)` fall back to `system-ui` / `monospace`.

4. Import styles once at app root, then use components:

```tsx
import '@cameleer/design-system/style.css'
import { Button, AppShell, ThemeProvider } from '@cameleer/design-system'
```

### Import Paths (Consumer)

```tsx
// All components from single entry
import { Button, Input, Modal, DataTable, KpiStrip, SplitPane, EntityList, LogViewer, StatusText, AppShell } from '@cameleer/design-system'

// Sidebar (compound component — compose your own navigation)
import { Sidebar, SidebarTree, useStarred } from '@cameleer/design-system'
import type { SidebarTreeNode } from '@cameleer/design-system'

// Types
import type { Column, DataTableProps, SearchResult, KpiItem, LogEntry } from '@cameleer/design-system'

// Providers
import { ThemeProvider, useTheme } from '@cameleer/design-system'
import { CommandPaletteProvider, useCommandPalette } from '@cameleer/design-system'
import { GlobalFilterProvider, useGlobalFilters } from '@cameleer/design-system'

// Utils
import { hashColor } from '@cameleer/design-system'

// Recharts theme (for advanced charts — treemap, radar, heatmap, etc.)
import { rechartsTheme, CHART_COLORS } from '@cameleer/design-system'
import type { ChartSeries, DataPoint } from '@cameleer/design-system'

// Styles (once, at app root)
import '@cameleer/design-system/style.css'
```