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Tyler Slaton 442d2150c3 feat(react-core): add position prop to CopilotSidebar (left/right) (#4710)
## What does this PR do?

Adds a `position?: \"left\" | \"right\"` prop to the v2 `CopilotSidebar`
(and the underlying `CopilotSidebarView`), letting consumers anchor the
sidebar to either side of the viewport. Defaults to `\"right\"` so
existing usage is unchanged.

```tsx
<CopilotSidebar position=\"left\" />
```

### What changes when `position` flips

- **Anchor:** `cpk:right-0` ↔ `cpk:left-0`
- **Border side:** `cpk:border-l` ↔ `cpk:border-r`
- **Off-screen translate (closed state):** `cpk:translate-x-full` ↔
`cpk:-translate-x-full`
- **Body push margin:** `document.body.style.marginInlineEnd` ↔
`marginInlineStart` (with the matching `transition` CSS property name)
- **Aside element:** picks up a `data-position` attribute for
styling/test hooks

`position` is in the `useLayoutEffect` deps, so toggling it at runtime
cleans up the prior side's body margin before applying the new one.

### Tests

New `CopilotSidebarView.position.test.tsx` (7 cases) —
default/right/left class assertions, off-screen translate direction, and
verification that the wrapper forwards through to the view. All 32
sidebar-area tests pass; full react-core suite (1167 tests) green with
no regressions.

### Storybook

Added `RightPosition` and `LeftPosition` stories under
`UI/CopilotSidebarView` for visual diffing.

## Related PRs and Issues

- N/A

## Checklist

- [x] I have read the [Contribution
Guide](https://github.com/copilotkit/copilotkit/blob/master/CONTRIBUTING.md)
- [ ] If the PR changes or adds functionality, I have updated the
relevant documentation
- [x] \"Allow edits by maintainers\" is checked

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2026-05-07 16:39:34 -07:00
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