Create a model for Result

It's better to use ngModel and make a model for results
This will allow us to have helper functions inside the model - like `get_results_of_file()` or general search queries too.

Start by locating the current result handling and existing ngModel usage in the project, since no file or test is named. Determine how results are represented and where helper queries belong; the work is done when results use a model that supports the proposed helpers without breaking existing behavior.

Written by the indexing model from the issue text.