N.1: I do not see the issue with #1 honestly. I never needed to actually unselect a building. If you need to know what a ressource tile does just hover for a split second over it and the tooltip will tell you. If the tooltip is not instant enough for you use CTRL ^^
N.2: I agree, SD should make the ideology decision postponable at least until the end of the turn. Depending on your playstyle this has a potential to be very annoying.
N.3 : The fix for this is that SD should implement ''Right clicking'' the notification icon. So when you get an upgrade Starbase prompt, you could right-click the prompt and it would center on the said base, or idle planet. This would save you an extra second everytime. As is I need to click done to get out of the build screen, check where the base/planet is and then click on it again to build my stuff.
I will add a N.4 : In the planet view, make is so you can shuffle around your planets while the ''Govern planet'' panel is open. I never use Global spending. I manually set the production wheel for each planet. Sometimes I want to quickly review my production wheels but I cant do it because I need to open and close the panel everytime I need to switch planet. SO ANNOYING!!