Fix: Layout-mode notes missing from MCP JSON and Markdown copy

[panrafal]

Problem

When the user attached a note to a Layout-mode item (placement or rearrange), the note was visible in the overlay but dropped from both outputs:

• Placements — the note is added via a popup that opens only after the placement is dropped. The sync effect early-exited (if (currentMap.has(p.id)) continue;) for already-synced placements, so later text edits never reached the server.
• Rearranges — section.note was never referenced in the sync payload at all, and pure note-only edits (no rect delta) weren't triggering any update.
• Markdown copy — generateDesignOutput / generateRearrangeOutput rendered component type, coordinates, and sizes but never the user's note.

Fix

• Placement sync — new placementSyncedTextMap ref tracks the last-synced p.text per id; when it diverges, PATCHes comment + placement.text via updateAnnotationOnServer. Cleared alongside placementAnnotationMap on server-driven deletes and in clearAll.
• Rearrange sync — appends the note to comment (mirroring the existing placement pattern "…— 'my note'"), triggers on note-only edits, and uses a "Note on X section" comment when nothing geometric changed. Kept the Annotation.rearrange schema unchanged for backwards compatibility — the note rides in comment, not a new field.
• Markdown output — generateDesignOutput emits - Note: "…" bullets for placements with text. generateRearrangeOutput emits notes per section and now includes sections whose only change is a note.

Files

• package/src/components/page-toolbar-css/index.tsx
• package/src/components/design-mode/output.ts

Wire format

No breaking changes. Annotation schema untouched. Existing consumers that read the composite comment string keep working; the note is appended to it with the same — "…" convention already used for placements.

Test plan

• Drop a placement → double-click → add a note → Copy → note appears in markdown, and GET <endpoint>/sessions/<id> shows it in comment and placement.text.
• Drag a section → add a note → Copy → note appears in markdown; server comment includes the note.
• Add a note without moving a section → still appears in both outputs.
• Edit an existing note → server annotation is PATCHed (not duplicated) and reflects the new text.

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