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I added some labels and converted most of the action divs/spans into real buttons or tabindexed pseudo-links. Whole interface should be now controllable by keyboard but that can be quite tedious. Later I will try to add more role attributes which should make it much more convenient.
I also don’t know how good is the screen readers’ support for dynamically added elements (the form to add a new source). Maybe I will need to use ARIA live regions.
Search form is hidden beneath the sidebar but it is probably accessible for screen readers, not sure if it is okay. I added search role, is it enough or is a heading needed?
The CSS is a little off but that can be also fixed later.