App payloads carried only the /app-icon endpoint URL, which 302s to the
icons hosting subdomain. Networks that mangle that redirect render no icon
at all, and every icon load pays a round trip for the hop.
Ship the direct subdomain URL as `iconCdnUrl` alongside it (taskbar items,
installedApps, recent/recommended launch apps, suggested apps), and have the
GUI load that first with the endpoint URL as a one-shot retry - desktop
taskbar, start menu, dashboard app grid and recents. Only rows whose `icon`
column is already an http(s) URL get one: a data: column means the resize
pipeline has not written anything to the subdomain yet.
Also folds the four copies of the generated-size list into one exported
APP_ICON_SIZES.
Daniel Salazar
799fc4ac3c