fix(runner): confirm focus moved before typing

InputText tapped its target, slept, then typed. Android and web both inject
into whatever holds focus, so a tap that missed sent the whole string somewhere
else and nothing reported it. On an emulator with a floating keyboard panel
parked over the password field, the tap pressed the keyboard's emoji key and
every step appended the password to the email instead, forever, because the
setup leaf is guarded on the password being empty.

The hierarchy is re-read after the tap and the target, or something in its
subtree, must hold focus. Platforms whose hierarchy carries no focused
attribute skip the read, so they pay nothing.

Claude-Session: https://claude.ai/code/session_01A5KmftdEJ49A9z5mF5ESrX

internal/runner/runner_test.go

@@ -822,6 +822,103 @@ func TestApplyAction_InputTextSurfacesFocusTapError(t *testing.T) {
 	})
 }
 
+// loginFocusOnEmail is the folio login screen as Android reports it once the
+// email field has been typed into: email holds focus, password does not.
+const loginFocusOnEmail = `{"attributes":{"resource-id":"root","bounds":"[0,0,1080,2340]"},"children":[
+	{"attributes":{"resource-id":"LoginEmail","text":"[email protected]","bounds":"[94,240,986,372]"},"focused":true,"children":[]},
+	{"attributes":{"resource-id":"LoginPassword","bounds":"[94,461,986,593]"},"focused":false,"children":[]}
+]}`
+
+const loginFocusOnPassword = `{"attributes":{"resource-id":"root","bounds":"[0,0,1080,2340]"},"children":[
+	{"attributes":{"resource-id":"LoginEmail","text":"[email protected]","bounds":"[94,240,986,372]"},"focused":false,"children":[]},
+	{"attributes":{"resource-id":"LoginPassword","bounds":"[94,461,986,593]"},"focused":true,"children":[]}
+]}`
+
+// A keyboard overlay window can sit over the field the focus tap aims at, so
+// the tap never reaches it and focus stays where it was. Typing then appends to
+// the previously focused field: on folio the password ran into the email field
+// and the login setup leaf retried forever.
+func TestApplyAction_InputTextStopsWhenAnotherFieldHoldsFocus(t *testing.T) {
+	fastFocusSettle(t)
+	tree, err := hierarchy.Parse(loginFocusOnEmail)
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+	driverMock := mockdriver.New()
+	driverMock.HierarchyJSON = loginFocusOnEmail
+	action := verifier.Action{
+		Kind: verifier.ActionKindInputText,
+		On:   "id:LoginPassword",
+		Text: "ledger123",
+	}
+
+	_, err = applyAction(context.Background(), driverMock, action, tree)
+	if err == nil {
+		t.Fatal("a focus tap that never focused the target must be reported, not typed through")
+	}
+	if !strings.Contains(err.Error(), "LoginEmail") {
+		t.Errorf("error must name the field holding focus, got: %v", err)
+	}
+	if containsAction(driverMock.Actions(), mockdriver.ActionInputText, "") {
+		t.Errorf("password text must not be typed into the focused email field: %v", driverMock.Actions())
+	}
+}
+
+func TestApplyAction_InputTextTypesWhenTargetTakesFocus(t *testing.T) {
+	fastFocusSettle(t)
+	tree, err := hierarchy.Parse(loginFocusOnEmail)
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+	driverMock := mockdriver.New()
+	driverMock.HierarchyJSON = loginFocusOnPassword
+	action := verifier.Action{
+		Kind: verifier.ActionKindInputText,
+		On:   "id:LoginPassword",
+		Text: "ledger123",
+	}
+
+	mustDispatch(t, driverMock, action, tree)
+	if !typedText(driverMock.Actions(), "ledger123") {
+		t.Errorf("expected InputText once the target holds focus, got %v", driverMock.Actions())
+	}
+}
+
+// Platforms whose hierarchy omits focus entirely (iOS) have nothing to compare,
+// so they must not pay a hierarchy read per InputText.
+func TestApplyAction_InputTextSkipsFocusCheckWhenHierarchyOmitsFocus(t *testing.T) {
+	fastFocusSettle(t)
+	tree, err := hierarchy.Parse(`{"attributes":{"resource-id":"root","bounds":"[0,0,1080,2340]"},"children":[
+		{"attributes":{"resource-id":"LoginPassword","bounds":"[94,461,986,593]"},"children":[]}
+	]}`)
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+	driverMock := mockdriver.New()
+	action := verifier.Action{
+		Kind: verifier.ActionKindInputText,
+		On:   "id:LoginPassword",
+		Text: "ledger123",
+	}
+
+	mustDispatch(t, driverMock, action, tree)
+	if containsAction(driverMock.Actions(), mockdriver.ActionHierarchy, "") {
+		t.Errorf("no focus to compare: expected no hierarchy read, got %v", driverMock.Actions())
+	}
+	if !typedText(driverMock.Actions(), "ledger123") {
+		t.Errorf("expected InputText, got %v", driverMock.Actions())
+	}
+}
+
+func typedText(actions []mockdriver.Action, text string) bool {
+	for _, action := range actions {
+		if action.Kind == mockdriver.ActionInputText && action.Text == text {
+			return true
+		}
+	}
+	return false
+}
+
 func TestApplyAction_V8InputTextTapsAtCoordinates(t *testing.T) {
 	fastFocusSettle(t)
 	driverMock := mockdriver.New()