fix: name the WordPress revision screen for library and layout revisions (audit L3)

lit/revision-restore takes only content types, so a write to a library entry
or a Theme Builder layout now answers with restore_url (wp-admin
revision.php for its revision_id), also per page in lit/divi-replace-text.
The guides and readme no longer present lit/revision-restore as the way back
for these types.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Integrations/Divi/Pages/DiviWriteAbility.php

@@ -41,6 +41,9 @@ abstract class DiviWriteAbility implements Ability
             'affected_count' => ['type' => 'integer'],
             'hidden_count' => ['type' => 'integer'],
             'backup_id' => ['type' => 'integer'],
+            // Library entries and Theme Builder layouts: their revision in WordPress' revision screen (audit L3 –
+            // lit/revision-restore takes only content types).
+            'restore_url' => ['type' => 'string'],
             // Theme Builder layouts: the enabled templates that show the layout – those the user may edit; the
             // others only as a count (ruling Q22).
             'templates' => ['type' => 'array', 'items' => ['type' => 'object']],