perf(web-test): detect .confirm notification for early exit in clickElement

Add .confirm CSS selector to the server-response waitForSelector in
clickElement. 1C web client shows notifications (Изменение/Проведение)
as .confirm elements after write/post operations. This allows early
exit instead of waiting the full 10s timeout. Записать: 14s → 2.6s.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -1500,7 +1500,7 @@ export async function clickElement(text, { dblclick } = {}) {
         // waitForSelector uses MutationObserver internally — doesn't block event loop.
         try {
           await page.waitForSelector(
-            '#modalSurface:not([style*="display: none"]), .balloon',
+            '#modalSurface:not([style*="display: none"]), .balloon, .confirm',
             { state: 'visible', timeout: 10000 }
           );
         } catch {}