feat!: remove change$ observable and rxjs dependency

[christianhg]

The PortableTextEditor.change$ observable isn't used internally anymore. It's
purely a legacy public API that allows consumers to read editor changes/events
through an Observable rather than through the ordinary subscription API. This
does not justify declaring rxjs as a peer dependency of PTE and therefore
this commit removes the change$ Observable along with the rxjs dependency.

BREAKING CHANGES:

• Removed PortableTextEditor.change$ property
• Removed EditorChanges type export (Subject<EditorChange>)
• Removed PatchObservable type export (Observable<...>)
• Removed rxjs from peerDependencies

Migration: Replace change$.subscribe() with editor.on() or
<EventListenerPlugin on={...} />. Every active EditorChange type
has a 1:1 equivalent in the new event API.

What's preserved:

• EditorChange type (still used by sanity's onEditorChange prop)
• PortableTextEditor class (separate deprecation path)
• All static methods and schemaTypes property

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Project	Deployment	Actions	Updated (UTC)
portable-text-editor-documentation	Ready	Preview, Comment	Feb 23, 2026 10:46pm
portable-text-example-basic	Ready	Preview, Comment	Feb 23, 2026 10:46pm
portable-text-playground	Ready	Preview, Comment	Feb 23, 2026 10:46pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 62f937e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@portabletext/editor	Major
@portabletext/plugin-character-pair-decorator	Major
@portabletext/plugin-emoji-picker	Major
@portabletext/plugin-input-rule	Major
@portabletext/plugin-markdown-shortcuts	Major
@portabletext/plugin-one-line	Major
@portabletext/plugin-paste-link	Major
@portabletext/plugin-sdk-value	Major
@portabletext/plugin-typeahead-picker	Major
@portabletext/plugin-typography	Major
@portabletext/toolbar	Major

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[skogsmaskin]

Nice! I like that we no longer have rxjs as a dependency here. If someone truly needs it to be an observable, they could create one from the EventListenerPlugin.