calcurse: sync with Google Calendar via calcurse-caldav

Hourly timer started from xmonad, plus UI hooks that sync before load and after exit. calcurse-sync notifies once when the OAuth login expires and restarts the daemon after imports, since it never re-reads its files.

.config/systemd/user/calcurse-sync.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Sync calcurse with Google Calendar
+
+[Service]
+Type=oneshot
+ExecStart=%h/.local/bin/calcurse-sync

.config/systemd/user/calcurse-sync.timer

@@ -0,0 +1,7 @@
+[Unit]
+Description=Sync calcurse with Google Calendar hourly
+
+[Timer]
+OnActiveSec=1min
+OnCalendar=hourly
+Persistent=true

.config/systemd/user/calcurse-today.service

@@ -1,5 +1,6 @@
 [Unit]
 Description=Notify today's calcurse events
+After=calcurse-sync.service
 
 [Service]
 Type=oneshot