Fix[Editorial Notes]: Persist block metadata on generation to link back notes on reload

[yogeshbhutkar]

What?

Closes #678

Why?

Editorial Notes store the root Note ID in block metadata so later review and refinement passes can associate a block with its Note thread. Without saving after a new noteId is linked, that metadata exists only in editor state and is lost after reload.

Ref:

ai/src/experiments/editorial-notes/hooks/useEditorialNotes.ts

Lines 463 to 468 in 6ceac22

	( dispatch( blockEditorStore ) as any ).updateBlockAttributes(
	block.clientId,
	{
	metadata: { ...existingMeta, noteId: note.id },
	}
	);

How?

createNote() now reports whether it created a new root Note thread and linked its ID to block metadata. Full-post review accumulates that signal across batches and saves post once at the end, only when a new noteId was linked. Single-block review also saves only when its review links a new noteId.

Use of AI Tools

AI assistance: Yes
Tool(s): Codex
Model(s): GPT-5.5
Used for: Initial code skeleton; final implementation was reviewed and edited by me.

Testing Instructions

1. Create a new post and add reviewable block content.
2. Run the Editorial Notes review.
3. Confirm Editorial Notes are created for the reviewed content.
4. Reload the editor.
5. Confirm the "Apply Editorial Updates" action is still available and works after reload.

Screencast

fix.mov

Changelog Entry

Fixed - Editorial Notes at block metadata being lost after reload when the editor had unsaved changes, preventing "Apply Editorial Updates" from finding the linked notes.