[Research] [Improvement] Find the best way to implement displaying questions conditionally

1. some questions depend on the answer from the previous one. if the answer to the previous question is 'no', the current question can be hidden.

2. find the way to display the correct keyboard type based on the question answer type

Please provide ideas for implementing these features in the comments. BE changes could also be suggested.

Start by reviewing the question flow and answer-type handling in the Android app, then inspect how questions are represented and rendered. Compare the requested conditional visibility and keyboard behavior with any backend question schema or API responses mentioned in the project. Done means the implementation approach is documented clearly enough to guide a follow-up change; this issue does not name files or tests.

Written by the indexing model from the issue text.