- Match scratchpads by WM_CLASS instead of title, so they no longer
get shifted to workspace 1 or lose track of their window
- Spawn one xmobar per connected screen (dynamicEasySBs)
- Pick the xrandr layout and tray monitor based on whether HDMI is
connected, and re-run it on monitor hotplug
- Don't let one failed startup step block the rest
- Make the startup command safe to re-run (no duplicate trayer/picom)