Proposal to change default skin to Timeless
Regarding issues 1 and 2 (the navigation tabs), I see no easy way to fix it. I am not skilled enough to make distinct icons for them. I considered moving them elsewhere, but I have no control over where (filed Phab:T251258).
Regarding the 3rd issue, it would fall under Phab:T146134. Unfortunately I don't think I can fix it without re-doing the UI with a more responsive grid system, which is a lot of work.