chore(release): add missing @emotion/styled peer to #691 migration note

Per PR review: library/package.json publishes six React peers
(react, react-dom, @mui/material, @emotion/react, @emotion/styled,
@xyflow/react); the migration note listed only five. Add @emotion/styled and
correct "five peers" to "six".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: FelixTJDietrich

.changeset/react-apollon-api.md

@@ -4,12 +4,12 @@
 
 Add a first-class React API and split the package into two entry points.
 
-- `@tumaet/apollon/react` exports an `<Apollon>` component plus `ApollonProvider`, `useApollonEditor`, `useApollonEditorOrThrow`, and `useApollonSubscription`. It treats `react`, `react-dom`, `@mui/material`, `@emotion/react`, and `@xyflow/react` as peer dependencies so a React host resolves a single shared copy.
+- `@tumaet/apollon/react` exports an `<Apollon>` component plus `ApollonProvider`, `useApollonEditor`, `useApollonEditorOrThrow`, and `useApollonSubscription`. It treats `react`, `react-dom`, `@mui/material`, `@emotion/react`, `@emotion/styled`, and `@xyflow/react` as peer dependencies so a React host resolves a single shared copy.
 - The default `@tumaet/apollon` entry stays framework-agnostic and bundles those dependencies, so non-React hosts install with zero peers.
 
 **Breaking changes — migrating from 4.x:**
 
-- React hosts: import from `@tumaet/apollon/react` and add the five peers above to your own dependencies.
+- React hosts: import from `@tumaet/apollon/react` and add the six peers above to your own dependencies.
 - Minimum Node is now 22 (was 20).
 - Removed the `ApollonOptions` fields `theme`, `copyPasteToClipboard`, `colorEnabled`, and `scale`, and the `theme` argument of `exportModelAsSvg`.
 - Low-level sync internals (`YjsSync`, format converters) moved to `@tumaet/apollon/internals` and are not covered by semver.