devlog #5 - visual updates

i decided i wanted to make tundra look a bit like serenityOS, so i modified the window header to include the distinctive red gradient. i also added a proper focusing system which required a decent rewrite of a portion of caribou (the wm).

also, i worked on centralising the wm. previously, windows handled their own focusing and closing but since i’ve discovered customevents windows now request this behaviour from the wm. finally, windows now auto-focus when you open them!