fix(selectors): emit valid XPath 1.0 string literals via concat()

Both the Go translator and the V8 runtime escaped " by prepending \,
which XPath 1.0 doesn't accept (its string literals have no escape
syntax). A `text:` value containing a quote produced malformed XPath
that chromedp/document.evaluate rejected.

Use the standard concat() composition: when the value contains both
' and ", split on " and join with `, '"', ` so each fragment is
wrapped in single or double quotes individually.

internal/driver/chrome/translate.go

@@ -37,7 +37,7 @@ func TranslateStringSelector(selector string) (string, bool, error) {
 	case "tag":
 		return cssEscape(value), false, nil
 	case "text":
-		return `//*[normalize-space(text())="` + xpathEscape(value) + `"]`, true, nil
+		return `//*[normalize-space(text())=` + xpathStringLiteral(value) + `]`, true, nil
 	case "desc", "label", "content-desc", "accessibilityLabel", "accessibilityText", "ariaLabel", "aria-label":
 		return `[aria-label="` + cssEscape(value) + `"]`, false, nil
 	case "descPrefix":
@@ -82,6 +82,28 @@ func cssEscape(value string) string {
 	return builder.String()
 }
 
-func xpathEscape(value string) string {
-	return strings.ReplaceAll(value, `"`, `\"`)
+// xpathStringLiteral wraps the value in a valid XPath 1.0 string literal.
+// XPath 1.0 has no escape syntax, so a value containing both ' and " must be
+// composed via concat(). The output already includes the surrounding quotes
+// (or concat() call), so callers don't quote it again.
+func xpathStringLiteral(value string) string {
+	if !strings.ContainsRune(value, '"') {
+		return `"` + value + `"`
+	}
+	if !strings.ContainsRune(value, '\'') {
+		return `'` + value + `'`
+	}
+	parts := strings.Split(value, `"`)
+	var builder strings.Builder
+	builder.WriteString(`concat(`)
+	for index, part := range parts {
+		if index > 0 {
+			builder.WriteString(`, '"', `)
+		}
+		builder.WriteByte('"')
+		builder.WriteString(part)
+		builder.WriteByte('"')
+	}
+	builder.WriteByte(')')
+	return builder.String()
 }

internal/driver/chrome/translate_test.go

@@ -13,6 +13,9 @@ func TestTranslateStringSelector_KnownKeys(t *testing.T) {
 		{"class:btn-primary", `[class~="btn-primary"]`, false},
 		{"tag:button", `button`, false},
 		{"text:Sign in", `//*[normalize-space(text())="Sign in"]`, true},
+		{`text:Say "hi"`, `//*[normalize-space(text())='Say "hi"']`, true},
+		{`text:it's`, `//*[normalize-space(text())="it's"]`, true},
+		{`text:it's "fine"`, `//*[normalize-space(text())=concat("it's ", '"', "fine", '"', "")]`, true},
 		{"desc:logout", `[aria-label="logout"]`, false},
 		{"label:logout", `[aria-label="logout"]`, false},
 		{"accessibilityLabel:logout", `[aria-label="logout"]`, false},

pkg/spec/src/web-runtime.ts

@@ -111,12 +111,22 @@ function selectorFromObject(selector: Record<string, string | boolean | undefine
   }
   if (textValue !== undefined && parts.length === 0) {
     return {
-      xpath: `//*[normalize-space(text())="${textValue.replace(/"/g, '\\"')}"]`,
+      xpath: `//*[normalize-space(text())=${xpathStringLiteral(textValue)}]`,
     };
   }
   return { css: parts.join("") };
 }
 
+// xpathStringLiteral wraps the value in a valid XPath 1.0 string literal.
+// XPath 1.0 has no escape syntax, so a value containing both ' and " must be
+// composed via concat().
+function xpathStringLiteral(value: string): string {
+  if (!value.includes('"')) return `"${value}"`;
+  if (!value.includes("'")) return `'${value}'`;
+  const parts = value.split('"');
+  return `concat(${parts.map((p) => `"${p}"`).join(`, '"', `)})`;
+}
+
 function selectorFromString(selector: string): { css?: string; xpath?: string } {
   const colon = selector.indexOf(":");
   if (colon <= 0) {
@@ -125,7 +135,7 @@ function selectorFromString(selector: string): { css?: string; xpath?: string }
   const kind = selector.slice(0, colon);
   const value = selector.slice(colon + 1);
   if (kind === "text") {
-    return { xpath: `//*[normalize-space(text())="${value.replace(/"/g, '\\"')}"]` };
+    return { xpath: `//*[normalize-space(text())=${xpathStringLiteral(value)}]` };
   }
   if (kind === "descPrefix") {
     return { css: `[aria-label^="${cssEscape(value)}"]` };