* itch.io: temporary Test itch.io button that logs what the API answers (not for merge)
* itch.io: show Test itch.io only while Debugging tools is on
* itch.io: version picker and installing free games
* itch.io: build the platform names outside joinToString so the composable call compiles
* itch.io: ask for the version before resuming an unfinished install
* itch.io: keep the chosen upload, save free games in the queue, don't auto-install a closed picker
* itch.io: install straight away when exactly one build is installable
* itch.io: show the picker again unless the game has exactly one build
* itch.io: ignore a second build tap while the picker is closing
* itch.io: empty a partial install before extracting so builds never mix
* stores: deleteTree removes a symlink without following it
* stores: skip symlinked folders in the uninstall walk, and only empty a partial install that is this game's own
