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/browser.mjs

@@ -1366,7 +1366,12 @@ export async function readSpreadsheet() {
 
   const { allCells } = await scanSpreadsheetCells(formNum);
 
-  if (allCells.size === 0) throw new Error('readSpreadsheet: no SpreadsheetDocument found. Report may not be generated yet.');
+  if (allCells.size === 0) {
+    // Check for state window messages (info bar) that explain why the report is empty
+    const err = await checkForErrors();
+    const hint = err?.stateText?.length ? err.stateText.join('; ') : '';
+    throw new Error('readSpreadsheet: no SpreadsheetDocument found.' + (hint ? ' State: ' + hint : ' Report may not be generated yet.'));
+  }
 
   const mapping = buildSpreadsheetMapping(allCells);
   if (!mapping) {

.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;
   })()`;
 }