Add docs

Author: theoribbi

apps/sandbox/app.json

@@ -17,7 +17,9 @@
       "supportsTablet": true,
       "bundleIdentifier": "com.theoribbi.sandboxprimitives",
       "infoPlist": {
-        "ITSAppUsesNonExemptEncryption": false
+        "ITSAppUsesNonExemptEncryption": false,
+        "NSPhotoLibraryUsageDescription": "This app needs access to your photo library to let you select and upload images.",
+        "NSPhotoLibraryAddUsageDescription": "This app needs access to save photos to your photo library."
       }
     },
     "android": {
@@ -49,7 +51,14 @@
     },
     "plugins": [
       "expo-router",
-      "@native-ui-org/native-modules"
+      "@native-ui-org/native-modules",
+      [
+        "expo-image-picker",
+        {
+          "photosPermission": "This app needs access to your photo library to let you select and upload images.",
+          "cameraPermission": "This app needs access to your camera to take photos."
+        }
+      ]
     ],
     "extra": {
       "router": {},

apps/sandbox/app/index.tsx

@@ -6,6 +6,7 @@ const primitives = [
   { name: "View", path: "/preview/view", description: "Layout container with cross‑platform a11y & asChild" },
   { name: "Text", path: "/preview/text", description: "Unified Text: RN on mobile, semantic tags on web" },
   { name: "Button", path: "/preview/button", description: "Unstyled, accessible button wrapper around Pressable" },
+  { name: "Field", path: "/preview/field", description: "Unstyled input field wrapper around TextInput, compatible with forms" },
   { name: "Collapsible", path: "/preview/collapsible", description: "Expandable content with controlled/uncontrolled state" },
   { name: "Accordion", path: "/preview/accordion", description: "Grouped collapsibles with single or multiple selection" },
   { name: "Alert", path: "/preview/alert", description: "Cross-platform alerts: native on mobile, custom on web" },