Improve error handling in entry edit mode and update sudo request tests for clarity and accuracy

src/hosts/tui/app.py

@@ -402,8 +402,12 @@ class HostsManagerApp(App):
 
     def watch_entry_edit_mode(self, entry_edit_mode: bool) -> None:
         """Update the right pane border title when entry edit mode changes."""
-        right_pane = self.query_one(".right-pane")
-        if entry_edit_mode:
-            right_pane.border_title = "Edit Entry"
-        else:
-            right_pane.border_title = "Entry Details"
+        try:
+            right_pane = self.query_one(".right-pane")
+            if entry_edit_mode:
+                right_pane.border_title = "Edit Entry"
+            else:
+                right_pane.border_title = "Entry Details"
+        except Exception:
+            # App not fully initialized yet, ignore
+            pass

src/hosts/tui/password_modal.py

@@ -113,7 +113,7 @@ class PasswordModal(ModalScreen):
             self.action_submit()
         elif event.button.id == "cancel-button":
             self.action_cancel()
-    
+
     def on_input_submitted(self, event: Input.Submitted) -> None:
         """Handle Enter key in password input field."""
         if event.input.id == "password-input":

tests/test_manager.py

@@ -44,14 +44,14 @@ class TestPermissionManager:
     @patch("subprocess.run")
     def test_request_sudo_prompt_success(self, mock_run):
         """Test requesting sudo with password prompt success."""
-        # First call (sudo -n true) fails, second call (sudo -v) succeeds
+        # First call (sudo -n true) fails, second call (sudo -S -v) succeeds
         mock_run.side_effect = [
             Mock(returncode=1),  # sudo -n true fails
-            Mock(returncode=0),  # sudo -v succeeds
+            Mock(returncode=0),  # sudo -S -v succeeds
         ]
 
         pm = PermissionManager()
-        success, message = pm.request_sudo()
+        success, message = pm.request_sudo("testpassword")
 
         assert success
         assert "access granted" in message
@@ -60,17 +60,31 @@ class TestPermissionManager:
 
         assert mock_run.call_count == 2
 
+    @patch("subprocess.run")
+    def test_request_sudo_no_password(self, mock_run):
+        """Test requesting sudo when no password is provided."""
+        # sudo -n true fails (password needed)
+        mock_run.return_value = Mock(returncode=1)
+
+        pm = PermissionManager()
+        success, message = pm.request_sudo()
+
+        assert not success
+        assert "Password required" in message
+        assert not pm.has_sudo
+        assert not pm._sudo_validated
+
     @patch("subprocess.run")
     def test_request_sudo_denied(self, mock_run):
         """Test requesting sudo when access is denied."""
         # Both calls fail
         mock_run.side_effect = [
             Mock(returncode=1),  # sudo -n true fails
-            Mock(returncode=1),  # sudo -v fails
+            Mock(returncode=1, stderr="access denied"),  # sudo -S -v fails
         ]
 
         pm = PermissionManager()
-        success, message = pm.request_sudo()
+        success, message = pm.request_sudo("testpassword")
 
         assert not success
         assert "denied" in message
@@ -234,7 +248,7 @@ class TestHostsManager:
             success, message = manager.enter_edit_mode()
 
             assert not success
-            assert "Cannot enter edit mode" in message
+            assert message == "Denied"
             assert not manager.edit_mode
 
     def test_enter_edit_mode_permission_validation_failure(self):