fix: improve shadow DOM support and fix iframe error message in Playwright

- Chain locators for shadow DOM instead of using >>> combinator
- Fix iframe error message to say "Element" instead of "Frame"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: DavertMik

lib/helper/Playwright.js

@@ -3568,7 +3568,7 @@ class Playwright extends Helper {
     }
 
     if (!frame) {
-      throw new Error(`Frame ${JSON.stringify(locator)} was not found by text|CSS|XPath`)
+      throw new Error(`Element ${JSON.stringify(locator)} was not found by text|CSS|XPath`)
     }
 
     try {
@@ -4149,6 +4149,21 @@ async function findElements(matcher, locator) {
 
   locator = new Locator(locator, 'css')
 
+  if (locator.isShadow()) {
+    const shadowPath = locator.value
+    let currentMatcher = matcher
+
+    for (let i = 0; i < shadowPath.length - 1; i++) {
+      const elementSelector = shadowPath[i]
+      currentMatcher = currentMatcher.locator(elementSelector)
+      const element = await currentMatcher.first()
+      currentMatcher = element
+    }
+
+    const finalSelector = shadowPath[shadowPath.length - 1]
+    return currentMatcher.locator(finalSelector).all()
+  }
+
   const locatorString = buildLocatorString(locator)
 
   return matcher.locator(locatorString).all()
@@ -4161,6 +4176,21 @@ async function findElement(matcher, locator) {
 
   locator = new Locator(locator, 'css')
 
+  if (locator.isShadow()) {
+    const shadowPath = locator.value
+    let currentMatcher = matcher
+
+    for (let i = 0; i < shadowPath.length - 1; i++) {
+      const elementSelector = shadowPath[i]
+      currentMatcher = currentMatcher.locator(elementSelector)
+      const element = await currentMatcher.first()
+      currentMatcher = element
+    }
+
+    const finalSelector = shadowPath[shadowPath.length - 1]
+    return currentMatcher.locator(finalSelector).first()
+  }
+
   return matcher.locator(buildLocatorString(locator)).first()
 }