feat(cropper): expand image export API

packages/cropper/docs/en-US/advanced/geometry-and-export.mdx

@@ -9,6 +9,8 @@ toc:
     title: Geometry functions
   - id: export
     title: Exporting an image
+  - id: api
+    title: API
   - id: cross-origin
     title: Cross-origin images
 ---
@@ -34,6 +36,27 @@ const [value, setValue] = React.useState({ x: 0, y: 0, zoom: 1 })
 
 ## Exporting an image {#export}
 
+The shortest path exports the current result through the component ref:
+
+```tsx
+import { Cropper, type CropperHandle } from "@workspace/cropper"
+
+const cropperRef = React.useRef<CropperHandle>(null)
+
+const result = await cropperRef.current?.getCropImage({
+  outputType: "base64",
+  type: "image/jpeg",
+  quality: 0.9,
+  width: 1200,
+})
+
+<Cropper ref={cropperRef} src={src} />
+```
+
+`getCropImage()` returns `undefined` until the image is ready. `outputType` defaults to `"blob"`; `"base64"` returns a data URL suitable for previews or form values. Quality must be between `0` and `1`.
+
+Use the pure function when no component instance is available:
+
 ```tsx
 const blob = await cropImage(src, area, {
   type: "image/webp",
@@ -42,7 +65,24 @@ const blob = await cropImage(src, area, {
 })
 ```
 
-Supplying only `width` or `height` preserves the crop aspect ratio. `shape: "circle"` clips through an ellipse; provide `background` when an opaque JPEG background is required.
+Supplying only `width` or `height` preserves the crop aspect ratio. `shape: "circle"` clips through an ellipse; provide `background` when an opaque JPEG background is required. `getCropImage(source, area, options)` is the corresponding pure function for Blob/base64 output.
+
+## API {#api}
+
+| Prop                           | Type                                | Description                                      |
+| ------------------------------ | ----------------------------------- | ------------------------------------------------ |
+| `src`                          | `string \| Blob`                    | An image URL, Blob, or File.                     |
+| `aspectRatio`                  | `number \| \`${number}:${number}\`` | Crop viewport ratio; defaults to `1`.            |
+| `width` / `height`             | matching `CSSProperties` value      | Optional inline container dimensions.            |
+| `value` / `defaultValue`       | `CropperValue`                      | Controlled or uncontrolled translation and zoom. |
+| `minZoom` / `maxZoom`          | `number`                            | Zoom range; defaults to `1` through `4`.         |
+| `shape`                        | `"rectangle" \| "circle"`           | Viewport shape.                                  |
+| `showGrid`                     | `boolean`                           | Whether to render the rule-of-thirds grid.       |
+| `onCropAreaChange`             | `(area) => void`                    | Runs when the valid source-image crop changes.   |
+| `onCropComplete`               | `(area, value) => void`             | Runs after an interaction or reset completes.    |
+| `onImageLoad` / `onImageError` | callbacks                           | Observe image loading state.                     |
+
+`CropperHandle` exposes `element`, `getCropArea()`, `getCropImage(options)`, and `reset()`. Use `rootRef` when a raw DOM ref is needed; the component `ref` is reserved for the imperative handle.
 
 ## Cross-origin images {#cross-origin}