fix: GlobalUsages finds every reference Divi renders, fail closed (F1, ruling P23)

Candidates come from one ID/status/type query: content with globalModule,
global_module or a JSON-escaped letter. Their content is read in chunks of
50 and parsed by UsageMatcher: Divi 5 openers are json-decoded (escaped keys
and values, leading zeros, any depth), and Divi 4 global_module attributes
are read in any quoting. An undecodable escaped opener counts as a possible
reference. Beyond 5000 candidates the rest count unread. The guide names
the formats and the wp_block parity. Also fixes the grammar of the
blocked-hidden count.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/Library/GlobalEdits.php

@@ -224,9 +224,9 @@ final class GlobalEdits
         }
         if ($report->blockedHidden > 0) {
             $parts[] = sprintf(
-                '%d %s, die dieses Konto nicht lesen darf',
+                '%d %s dieses Konto nicht lesen darf',
                 $report->blockedHidden,
-                $report->blockedHidden === 1 ? 'Eintrag' : 'Einträge'
+                $report->blockedHidden === 1 ? 'Eintrag, den' : 'Einträge, die'
             );
         }