feat(web-test): detect SpreadsheetDocument state bar (stateText)

Extract info bar messages from .stateWindowSupportSurface elements
into errors.stateText — covers missing parameters, "report not
generated", "settings changed", and "generating..." states.
readSpreadsheet() now includes the state message in its error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/web-test/scripts/dom.mjs

@@ -1176,7 +1176,15 @@ export function checkErrorsScript() {
       }
     }
 
-    return (result.balloon || result.messages || result.modal || result.confirmation) ? result : null;
+    // 5. SpreadsheetDocument state window (info bar inside moxelContainer)
+    // Shows messages like "Не установлено значение параметра X" or "Отчет не сформирован"
+    const stateWins = [...document.querySelectorAll('.stateWindowSupportSurface')].filter(el => el.offsetWidth > 0);
+    if (stateWins.length) {
+      const texts = stateWins.map(el => el.innerText?.trim()).filter(Boolean);
+      if (texts.length) result.stateText = texts;
+    }
+
+    return (result.balloon || result.messages || result.modal || result.confirmation || result.stateText) ? result : null;
   })()`;
 }