feat: self-portaling DetailPanel via AppShell portal target

DetailPanel now uses createPortal to render itself into
#cameleer-detail-panel-root, a div that AppShell places as a
direct sibling of .main in the top-level flex row. This means
pages can render <DetailPanel> anywhere in their JSX and it
automatically appears at the correct layout position.

AppShell's detail prop is deprecated and ignored — the portal
handles positioning automatically.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -1,18 +1,19 @@
 {
-  "name": "cameleer3",
-  "version": "0.0.0",
+  "name": "@cameleer/design-system",
+  "version": "0.1.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "cameleer3",
-      "version": "0.0.0",
+      "name": "@cameleer/design-system",
+      "version": "0.1.3",
       "dependencies": {
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
         "react-router-dom": "^7.0.0"
       },
       "devDependencies": {
+        "@playwright/test": "^1.58.2",
         "@testing-library/jest-dom": "^6.6.3",
         "@testing-library/react": "^16.3.0",
         "@testing-library/user-event": "^14.6.1",
@@ -24,6 +25,11 @@
         "vite": "^6.0.0",
         "vite-plugin-dts": "^4.5.4",
         "vitest": "^3.0.0"
+      },
+      "peerDependencies": {
+        "react": "^19.0.0",
+        "react-dom": "^19.0.0",
+        "react-router-dom": "^7.0.0"
       }
     },
     "node_modules/@adobe/css-tools": {
@@ -925,6 +931,22 @@
         "resolve": "~1.22.2"
       }
     },
+    "node_modules/@playwright/test": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.58.2.tgz",
+      "integrity": "sha512-akea+6bHYBBfA9uQqSYmlJXn61cTa+jbO87xVLCWbTqbWadRVmhxlXATaOjOgcBaWU4ePo0wB41KMFv3o35IXA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.58.2"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -2874,6 +2896,53 @@
         "pathe": "^2.0.3"
       }
     },
+    "node_modules/playwright": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.58.2.tgz",
+      "integrity": "sha512-vA30H8Nvkq/cPBnNw4Q8TWz1EJyqgpuinBcHET0YVJVFldr8JDNiU9LaWAE1KqSkRYazuaBhTpB5ZzShOezQ6A==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.58.2"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.58.2.tgz",
+      "integrity": "sha512-yZkEtftgwS8CsfYo7nm0KE8jsvm6i/PTgVtB8DL726wNf6H2IMsDuxCpJj59KDaxCtSnrWan2AeDqM7JBaultg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/playwright/node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
     "node_modules/postcss": {
       "version": "8.5.8",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.8.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cameleer/design-system",
-  "version": "0.1.2",
+  "version": "0.1.5",
   "type": "module",
   "main": "./dist/index.es.js",
   "module": "./dist/index.es.js",

src/design-system/composites/DetailPanel/DetailPanel.tsx

@@ -1,4 +1,5 @@
 import { useState, type ReactNode } from 'react'
+import { createPortal } from 'react-dom'
 import styles from './DetailPanel.module.css'
 
 interface Tab {
@@ -22,7 +23,7 @@ export function DetailPanel({ open, onClose, title, tabs, children, actions, cla
 
   const activeContent = tabs?.find((t) => t.value === activeTab)?.content
 
-  return (
+  const panel = (
     <aside
       className={`${styles.panel} ${open ? styles.open : ''} ${className ?? ''}`}
       aria-hidden={!open}
@@ -65,4 +66,8 @@ export function DetailPanel({ open, onClose, title, tabs, children, actions, cla
       )}
     </aside>
   )
+
+  // Portal to AppShell level if target exists, otherwise render in place
+  const portalTarget = document.getElementById('cameleer-detail-panel-root')
+  return portalTarget ? createPortal(panel, portalTarget) : panel
 }

src/design-system/layout/AppShell/AppShell.tsx

@@ -4,17 +4,18 @@ import type { ReactNode } from 'react'
 interface AppShellProps {
   sidebar: ReactNode
   children: ReactNode
+  /** @deprecated DetailPanel now portals itself automatically. This prop is ignored. */
   detail?: ReactNode
 }
 
-export function AppShell({ sidebar, children, detail }: AppShellProps) {
+export function AppShell({ sidebar, children }: AppShellProps) {
   return (
     <div className={styles.app}>
       {sidebar}
       <div className={styles.main}>
         {children}
       </div>
-      {detail}
+      <div id="cameleer-detail-panel-root" />
     </div>
   )
 }