fix(spec): match a merged label by its leading name on web too

The native desc rule accepts the label or the label at the head of an iOS
merged label; both web translators compared the whole string, so the same
selector matched natively and missed on web. The live-page parity test
caught it.

internal/driver/chrome/translate.go

@@ -40,7 +40,12 @@ func TranslateStringSelector(selector string) (string, bool, error) {
 		return cssEscape(value), false, nil
 	case "text":
 		return `//*[normalize-space(text())=` + xpathStringLiteral(value) + `]`, true, nil
-	case "desc", "label", "content-desc", "accessibilityLabel", "accessibilityText", "ariaLabel", "aria-label":
+	case "desc":
+		// Mirrors the native rule: the label itself, or the label at the head of
+		// an iOS merged label ("account_card:7, Tim, $100").
+		escaped := cssEscape(value)
+		return `:is([aria-label="` + escaped + `"], [aria-label^="` + escaped + `, "])`, false, nil
+	case "label", "content-desc", "accessibilityLabel", "accessibilityText", "ariaLabel", "aria-label":
 		return `[aria-label="` + cssEscape(value) + `"]`, false, nil
 	case "descPrefix":
 		return `[aria-label^="` + cssEscape(value) + `"]`, false, nil

internal/driver/chrome/translate_test.go

@@ -16,7 +16,8 @@ func TestTranslateStringSelector_KnownKeys(t *testing.T) {
 		{`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},
+		// desc also accepts an iOS merged label, the way internal/hierarchy does.
+		{"desc:logout", `:is([aria-label="logout"], [aria-label^="logout, "])`, false},
 		{"label:logout", `[aria-label="logout"]`, false},
 		{"accessibilityLabel:logout", `[aria-label="logout"]`, false},
 		{"aria-label:Sign in", `[aria-label="Sign in"]`, false},