Share hypr_refresh; capture the work laptop's own units

Both laptops run hypr_refresh and their unit files had diverged. The work
laptop's is the refined one — Type=oneshot, which is correct for a script
that exits, a 15s interval with AccuracySec, and a comment explaining the
wallpaper-daemon guard. system76 had Type=simple with Restart=on-failure,
which respawns a oneshot script continuously. Shared version wins.

Three more units existed only on the work laptop and were untracked:
backlight-probe, kanshi and mopidy.

hosts/system76/systemd/hypr_refresh.service

@@ -1,11 +0,0 @@
-[Unit]
-Description=Refresh Hyprland Wallpaper and Colors
-After=graphical-session.target
-
-[Service]
-Type=simple
-ExecStart=%h/.dotfiles/common/bin/hypr_refresh
-Restart=on-failure
-
-[Install]
-WantedBy=default.target

hosts/system76/systemd/hypr_refresh.timer

@@ -1,9 +0,0 @@
-[Unit]
-Description=Run hypr_refresh every minute after boot
-
-[Timer]
-OnBootSec=1min
-OnUnitActiveSec=1min
-
-[Install]
-WantedBy=timers.target