fix: Task 6 review round 1 - admin label overlap, heading default level, structure deny-list, row widths (S41)

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

src/Integrations/Divi/Pages/DiviUpdateAbility.php

@@ -7,7 +7,9 @@ namespace LIT\MCP\Integrations\Divi\Pages;
 use LIT\MCP\Abilities\Ability;
 use LIT\MCP\Abilities\Errors;
 use LIT\MCP\Abilities\ToolResult;
+use LIT\MCP\Integrations\Divi\BlockTree\AttrMap;
 use LIT\MCP\Integrations\Divi\BlockTree\Block;
+use LIT\MCP\Integrations\Divi\Compose\Composer;
 use WP_Error;
 
 /**
@@ -20,6 +22,8 @@ use WP_Error;
  */
 final class DiviUpdateAbility implements Ability
 {
+    private const SIZING = 'module.decoration.sizing';
+
     public function __construct(private DiviWriter $writer)
     {
     }
@@ -117,7 +121,7 @@ final class DiviUpdateAbility implements Ability
         $invalidPaths = false;
         /** @var array<string, int> $seen id => position of its first change */
         $seen = [];
-        /** @var list<array{0: Block, 1: array<string, mixed>}> $updates */
+        /** @var list<array{0: Block, 1: array<string, mixed>, 2: string}> $updates */
         $updates = [];
         foreach ($changes as $position => $change) {
             $field = sprintf('changes[%d]', $position);
@@ -150,7 +154,11 @@ final class DiviUpdateAbility implements Ability
             $result = $composer->update($block, $change, $field);
             $errors += $result['errors'];
             $invalidPaths = $invalidPaths || $result['invalid_paths'] !== [];
-            $updates[] = [$block, $result['attrs']];
+            $updates[] = [$block, $result['attrs'], $field];
+        }
+
+        if ($errors === []) {
+            $errors = $this->rowWidths($page, $composer, $updates);
         }
 
         if ($errors !== []) {
@@ -172,4 +180,55 @@ final class DiviUpdateAbility implements Ability
 
         return $this->writer->save($this->name(), $page, $change, $input);
     }
+
+    /**
+     * Ruling S41: a column whose desktop width changes must leave its row filled exactly – the
+     * rules of "columns" (Composer::rowWidthsError()), checked over the row after all changes.
+     *
+     * @param list<array{0: Block, 1: array<string, mixed>, 2: string}> $updates
+     * @return array<string, string>
+     */
+    private function rowWidths(DiviPage $page, Composer $composer, array $updates): array
+    {
+        $new = [];
+        $rows = [];
+        foreach ($updates as [$block, $attrs, $field]) {
+            if ($block->name() !== 'divi/column' || self::width($attrs) === self::width($block->attrs())) {
+                continue;
+            }
+
+            $new[spl_object_id($block)] = $attrs;
+            $row = $page->index->parentOf($block);
+            if ($row instanceof Block) {
+                $rows[spl_object_id($row)]['row'] = $row;
+                $rows[spl_object_id($row)]['fields'][] = $field;
+            }
+        }
+
+        $errors = [];
+        foreach ($rows as ['row' => $row, 'fields' => $fields]) {
+            $widths = [];
+            foreach ($row->children() as $column) {
+                $widths[] = self::width($new[spl_object_id($column)] ?? $column->attrs());
+            }
+
+            $error = $composer->rowWidthsError($widths);
+            if ($error !== null) {
+                foreach ($fields as $field) {
+                    $errors[$field . '.attrs.' . self::SIZING] = $error
+                        . ' (Breiten aller Spalten der Zeile zusammen ändern)';
+                }
+            }
+        }
+
+        return $errors;
+    }
+
+    /** @param array<string, mixed> $attrs */
+    private static function width(array $attrs): mixed
+    {
+        $sizing = AttrMap::desktop($attrs, self::SIZING);
+
+        return is_array($sizing) ? ($sizing['flexType'] ?? null) : null;
+    }
 }