fix: admin UI review round 1 (S47) - Art labels, usage only on success, result fallback

- Art column: only lit/media-delete and lit/divi-delete say "löscht",
  lit/post-trash "Papierkorb", other destructive tools "überschreibt".
- ConnectionUsage records only responses with status < 400 (mcp-oauth answers
  auth failures with WP_REST_Response 401, not WP_Error).
- Log result column: translated "unbekannt" instead of the raw value.

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

src/Admin/LogListTable.php

@@ -130,7 +130,7 @@ final class LogListTable extends \WP_List_Table
         [$icon, $word] = match ($result) {
             'ok' => ['yes-alt', __('erfolgreich', 'wp-lit-mcp')],
             'partial' => ['warning', __('teilweise', 'wp-lit-mcp')],
-            default => ['dismiss', $result],
+            default => ['dismiss', __('unbekannt', 'wp-lit-mcp')],
         };
 
         return sprintf(