Rework keyboard nav and adjust for v1.0.7

• Fixed arrow navigation through the search results after entering search terms not working.
• Improved arrow navigation while searching: Previously, it was necessary to arrow down into the results after entering search terms before horizontal arrow navigation through the search results would work. This was changed, so that e.g. arrow right will now immediately move to the second search result, for a more friction-free search and launch experience.
• Tab and Shift+Tab can now be used to cycle through the search field, the system favorites (Shutdown & co) and the category list.