Suggest mode: Surface Apply/Reject in the collaboration sidebar

[adamsilverstein]

Overview

One of three replacement PRs for the now-closed #77407. This slice wires Apply / Reject sidebar UI on top of the summary + attribute-conflict work from #78352.

Tracking issue: #73411.

What's in this PR

Collaboration sidebar

• useSuggestionDecision hook in suggestion-actions.js — A single source of truth for Apply / Reject behavior. Both the note header (icon buttons) and the note body (resolution state, staleness dialog) read from the same hook, so their behavior cannot diverge.
• Icon-only Apply / Reject buttons in the note header (check, closeSmall icons from @wordpress/icons).
• Note body renders the SuggestionSummary plus the staleness confirmation dialog when hasAttributeConflict returns true.
• utils.js — helpers shared between note components for reading the suggestion-related metadata.

Tests

• Unit: test/utils.js extended for the new helpers.
• e2e: block-notes.spec.js (new spec covering Apply / Reject flows) and editor-intent-switcher.spec.js (snackbar assertions).

Test plan

npm run test:unit -- packages/editor/src/components/collab-sidebar
npm run test:e2e -- test/e2e/specs/editor/various/block-notes.spec.js
npm run test:e2e -- test/e2e/specs/editor/various/editor-intent-switcher.spec.js

Manual:

1. Switch to Suggest mode (snackbar confirms) and edit a paragraph.
2. Switch back to Edit mode; open the note in the collab sidebar.
3. Apply button (check icon) accepts the suggestion; Reject (close icon) discards.
4. Edit the same paragraph's attributes in another window, then open the original suggestion: the staleness dialog appears only if the divergent attributes overlap (per hasAttributeConflict).

Replaces part of #77407.

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🗺️ PR Stack Navigation

#	PR	Phase
1	#77403 Intent scaffolding	Edit / Suggest / View mode
2	#77404 Overlay capture	In-memory suggestion overlay
3	#77405 Provider + Accept/Reject	_wp_suggestion meta, provider, sidebar actions
4	#77406 Summary + docs + attribute tests	Add/Delete/Formatting summary, architecture stub, conflict scoping
5a	#78351 REST permissions and PHP coverage	Permissions, payload cap, PHP tests
5b	#78352 Summary + attribute conflict + docs	Renderer, per-attribute staleness, architecture docs
5c	#78353 Surface Apply/Reject in the collaboration sidebar ← this PR	Icon buttons + e2e + sidebar wiring
6	#78308 Auto-save subsystem	Background debounced save (replaces commit-bar)

📋 Tracking issue: #73411

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Co-authored-by: adamsilverstein <adamsilverstein@git.wordpress.org>

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