fix: final review minors m-1 to m-8

- m-1: the no-change Divi result carries preview_url/edit_url too
- m-2: overview names replace-text's per-page tree_rev
- m-3: divi-shortform documents validation_failed vs not_found for unknown IDs
- m-4: DiviWriter/DiviPageLoader final (no mocks left), neutral NewDraft
  log detail, snapshots are Etappe 4
- m-5: Tested up to 7.1, changelog completed
- m-6: content-create warns when the extras changed the stored layout
- m-7: deleting a whole section outlines nothing instead of the next one
- m-8: uninstall removes the user meta lit_mcp_log_per_page; readme lists it

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

tests/Unit/Integrations/Divi/Pages/DiviWriterTest.php

@@ -105,10 +105,43 @@ final class DiviWriterTest extends TestCase
         $writer = $this->writer($saver, FakeChangeLog::forbidden());
         $page = $writer->page(['post_id' => 7, 'tree_rev' => Rev::of($content)]);
 
+        Functions\when('get_preview_post_link')->justReturn('https://kunde.test/?page_id=7&preview=true');
+
         $result = $writer->save('lit/divi-update', $page, new DiviChange('nichts'), []);
 
         self::assertSame(Rev::of($content), $result['tree_rev']);
         self::assertStringStartsWith('Keine Änderung', $result['summary']);
+        // Review m-1: the same result shape as a save, URLs included.
+        self::assertSame('https://kunde.test/?page_id=7&et_fb=1', $result['edit_url']);
+        self::assertSame('https://kunde.test/?page_id=7&preview=true', $result['preview_url']);
+    }
+
+    /** Review m-7: a deleted whole section has no section left to outline (its ID now names the next one). */
+    public function testDeletingAWholeSectionOutlinesNothing(): void
+    {
+        $content = DiviFixtures::markup('synthetic-basic.html');
+        DiviFixtures::givenPost($content);
+        $saver = Mockery::mock(DiviSaver::class);
+        $saver->allows('save')->andReturnUsing(static function (WP_Post $post, string $new): array {
+            DiviFixtures::givenPost($new);
+
+            return ['revision_id' => 811, 'warnings' => []];
+        });
+        $input = ['post_id' => 7, 'tree_rev' => Rev::of($content)];
+        Functions\when('do_action')->justReturn(null);
+        Functions\when('get_preview_post_link')->justReturn('https://kunde.test/?page_id=7&preview=true');
+        $writer = $this->writer($saver, new FakeChangeLog(55));
+        $page = $writer->page($input);
+        $section = $page->index->find('s0');
+        $page->document->children()[0]->removeChild($section);
+
+        $result = $writer->save('lit/divi-delete', $page, (new DiviChange('gelöscht'))->removed('s0', $section), $input);
+
+        self::assertNull($result['outline']);
+        self::assertSame([['s0', 'divi/section', 'deleted']], array_map(
+            static fn (array $c): array => [$c['id'], $c['type'], $c['action']],
+            $result['changed']
+        ));
     }
 
     public function testSavesAndReportsChangedNodesOutlineAndTheNewTreeRev(): void